compact ANTENNAS

small Powerful Antennas

Ham Radio LMR – Land Mobile Radio (Govt, Business, Marine, GMRS) Scanner CB

Elite Antennas for Elite Radio-Antenna Systems

Unique High Performance Attractive

Patented Technology – Quality Machining & Skillfully Hand-Crafted

Each Antenna manufactured is Precisely Tested/Tuned before shipment.

MADE IN THE USA

Vehicle

7.5″, 9″ VHF/UHF models Often allowing passage into garages, drive-thru and below overhangs and branches

CB, 10 Meter models Ultimate performance

Home

For HOA’s, condo’s, apartments, homes

Examples:

7.5″, 9″ VHF/UHF models on CompacCounterpoise (see COMPACtenna’s optimized ground plane system below)

for attic, inconspicuous (“stealth”) roof installation, backyard mast/pole

2 Meter Band CAPTURE BEAM-X for indoor or outdoor use

CB, 10 Meter models on metal roof (upper part) of house/building/shed, or

well supported metal gutter/trim, metal railing

using a 3/8″-24 CB style magnet/clamp/bracket mount as appropriate

[Outside installation is recommended to decrease noise from indoor switching power supplies

and other electrical devices.]

Parks (POTA), Camp Grounds Field Emergency Deployment

[Follow local building codes including NEC grounding/lightning/etc. and NFPA guidelines.]

[Follow applicable RF-Exposure Regulations.]

[Professional Installation recommended.]

Links to Specific Products

Follows beneficial information

7.5″/9″ VHF/UHF Antennas

Models: 2M/440 2M/220/440 2M/440PLUS 220MAX LMR-I SCAN-III

Generally, best performance of a mobile antenna is achieved with location at the top of the vehicle.

Long antennas can be unsightly and often do not allow travel into garages, beneath underpasses,

and standard technology short antennas have significantly decreased performance and bandwidth.

The short (~7.5″/9″ models) yet powerful COMPACtenna

is designed for best results (SWR, Performance) at an UPPER CORNER of a vehicle.

After reading this ‘HOME’ page, see the helpful ‘INSTALLS’ page.

QST (ARRL) August, 2022:

“This COMPACtenna Invention by Dr. Jack Nilsson is the first real new development in antenna communication design since Marconi/Tesla,

a paradigm shift in thinking that works amazingly well.”

Dr. Marcus Durham, PhD Electronics Engineering, Life Fellow IEEE

NMOD, Amateur Extra

Greater Range overall in our real-world obstructed environment (buildings, hills, etc.)

Witnessed by Donald with simplex net test:

Patented COMPACtenna Revolutionary Design – small yet Powerful

With a special design construct of spiraled and cylindrical metal sheeting

including ‘extended flat monofilar spiral coils’, antenna efficiency is maximized

with all resistance, inductance and capacitance (matching) accomplished

by the physical metallic geometric form of the antenna itself,

as opposed to internal or external components of other designs

where there is loss, resistive and field-to-ground.

“Magnetic Field Resonator”: This built-in resonating matching system

is an effectual component of the electromagnetic E & H fields production,

resulting in better performance than expected for such a small antenna.

With a particularly strong magnetic near field, proximity noise is reduced.

And resulting diverse effective electromagnetic fields

further enhance performance in our world of (dynamic) obstructions,

mitigating signal drops, reducing flutter, and increasing reliable range.

Broad elevation coordinate signal pattern, phase shift of same polarization, as well as elliptical polarization of COMPACtenna,

provides stabilized VHF/UHF signals in our common Non Line of Sight environments,

with temperature and humidity inversion pathways as well as tropospheric propagation, satellite communications.

COMPACtenna Science & Technology increases the number of usable regional repeaters (and simplex stations) in common environments.

This is due to its Non-Line-Of-Sight capabilities.

The benefit applies to COMPACtenna on vehicles, as well as COMPACtenna with the CompacCounterpoise for base stations.

The 2018 Dayton International Hamvention – New product Showcase 5 minute Presentation by Dr. Jack Nilsson, Inventor – COMPACtenna, YouTube Link

COMPACtenna Quanta – Near & Far Fields – 1 Hr. Talk by Dr. Jack Nilsson, Inventor – COMPACtenna,

then 20 minute Q&A – Conejo Valley (CA) Amateur Radio Club 1.20.22 – YouTube Link

“…consistently strong signal …while he drove all the way to Rancho Santa Margarita, through areas that would otherwise produce marginal signals with a more common antenna. …

Resulting diverse effective electromagnetic fields are claimed to mitigate signal drops, reduce flutter, and increase reliable range, which Randy has confirmed.”

Newsletter Article – COMPACtenna Study – County of Orange, CA Radio Amateur Civil Emergency Service

Appreciation: County of Orange, CA Radio Amateur Civil Emergency Service – Ken Bourne, W6HK, OCRACES Chief Radio Officer, Randy Benicky, N6PRL

YouTube Link to Testing & Analysis of COMPACtenna vs. ‘Standard Tech. Antennas’ by Josh Nash of Ham Radio Crash Course

COMPACtenna Users say: it LASTS a LONG TIME – they LIKE the UPPER CORNER PLACEMENT – KNOWLEDGEABLE OPERATORS LOVE IT

Reception and Transmission Testing:

RECEIVE Test – COMPACtenna Reduces Flutter Even in Underground Tunnels – a 1 minute YouTube Shorts

TRANSMIT TEST – 12 Minute YouTube Video

KK4SBS

7.5″ model 2M/220/440

Not sure what sort of … magic wizardry you’ve pulled off here but the performance of the 70cm/1.25m/2m tri-band

COMPACtenna is absolutely phenomenal!

The performance on all three bands, right out of the box, has been nothing short of incredible.

I had been running a B-10NMO (70cm/2m & 12″ tall).

Since switching to the COMPACtenna, I am now receiving reports of full quieting on repeaters that I previously struggled to even Rx at ~S5.

I’m now able to Rx those same machines at S8-S9+ with no issues and to my shock with no trouble on Rx/Tx in the areas I used to struggle.

So thank you for engineering such an awesome product. …

From eHam.net :

N3JHU – VHF/UHF Long Range Enthusiast

[below from QRZ.com public info.]

124 MILES !

ELECTRIC VEHICLES [Also Electronic Components of Gas-Powered Vehicles]

RF noise (EMI) that can be generated by increasingly popular electric vehicles can lead to problems (EMC) with receivers and transceivers.

The COMPACtenna with its beneficial balance of substantial electric and magnetic components in the Near Field

(and field-photon synergistic harmonious summation resulting in a powerful EM Far Field)

has the potential to mitigate such interference.

Danny Harber, KI5EXY, active in the Montgomery County, Texas area FEMA, Search & Rescue, and ARES communications found this

to be another important benefit of COMPACtenna:

On my Tesla vehicle, I have been testing various antennas including long high gain VHF/UHF ones.

There is a noise problem when driving as well as when parked in the ‘On’ mode,

even with the repeater only 8 miles from my location.

The COMPACtenna does not have that issue.

SATELLITE COMMUNICATIONS

With hemispheric signal pattern and elliptical polarization, this novel technology is also an excellent, easy to use satellite communications antenna.

QST August 2022 (ARRL):

Satellite operation was one of the other use cases
suggested in the instructions. While using the radio in
my car, I tried a couple of FM satellite passes with the
new ISS repeater and SO-50. On both occasions I was
able to get into the satellites and make a couple of
contacts.

Brad Smith, KC9UQR – Summary of Comments:

I use the COMPACtenna.
It is elliptically polarized …and is also very good at high elevations/working directly overhead.
…there is no “doughnut hole”.
It is a very good satellite antenna.
It does work better than a vertical.
I have tried many antennas, including 1/4, 1/2, and 5/8 wave verticals and an eggbeater.
I am very impressed by this little antenna.

The proof is when you get out into the field and make a contact and I am doing that every day.

With challenges of intricate beam antennas, multi-axis rotators-positioners, switching between LHCP and RHCP and maintenance,

omni-directional antennas have been tried for satellite communications.

Many report limited success with such as ‘ground-plane’, J-pole, and discone types.

Some, therefore decide on the ‘Lindenblad’ circularly polarized omni-directional antenna, a rather involved design,

but which has been referred to as the ‘Ultimate Satellite Omni Antenna’.
From AMSAT.org
Article by Howard Sodja, W6SHP
[Radio Amateur Satellite Corporation]

This DX Engineering customer found the COMPACtenna 2M/440+ (PLUS) antenna provided even greater success than his Lindenblad antenna with Satellite Communications:

Satellite Contact by Eric Hofer, KJ4YZI – Ham Radio Concepts YouTube Link

LAND MOBILE RADIO – Government & Commercial Communications

COMPACtenna: model LMR-I

From eHam.net :

AF1UD reports on the LMR-I:

I really like it.

I get the same performance that I got out of the Comet CA-2X4SR in 1/4 of the size!

The big thing is that in my area I would always lose VHF reception going down this main road… I no longer lose reception!

8.1.2025

Mike, AI7HP and his group in the state of Washington are involved in commercial

Land Mobile Radio (LMR) as well as ham radio.

They have much experience with COMPACtenna and Mike wrote:

The COMPACtennas we have purchased and use:

10 LMR-I antennas for both mobile and base mode
4 2M/220/440 antennas, one in base mode, the others in mobile mode
4 2 Meter/440+ antennas, one in base mode, the others in mobile mode

Commercial Land Mobile Radio (LMR) System:

About a year ago we installed a licensed commercial radio network in the eastern King County area of Washington. There are three base stations 28 miles away from each other, each with a COMPACtenna LMR-I antenna on a CompacCounterpoise Base Station Radials System only about 30’ above ground, yet covering an impressive wide area that spreads out about 40 miles east and west. We use the Anytone 578/878 Plus system in commercial mode with one as a 578 Single Frequency Repeater. The Anytone 578/878 radios are primarily digital DMR with security built in.

The reasons we decided on the Compactenna LMR-I antennas for the commercial system are:
Bandwidth, and the Performance Gain, Period.

As mobile antennas, and as repeater antennas on the COMPACtenna CompacCounterpoise Base Station Radials System, they are exceptional.

HOA – Commercial and Ham Radio:

I use COMPACtenna models LMR-I, 2M/220/440 and 2M/440+,
each on a COMPACtenna CompacCounterpoise Base Station Radials System.
The results are superb.

Mobile Ham Radio:

I’ve been using the Compactenna model 2M/220/440 antenna
on my personal vehicles for years.
Signal reports have ALL been very positive, even at 60+ miles away.
People are “shocked” with the clarity and range, Transmit & Receive.

Some operators have told me COMPACtenna Technology is just Snake Oil, an expensive scam,
or that the antennas could never perform like a whip.
ALL FALSE.
The Compactenna Technology LMR-I and Ham Radio antennas perfectly meet our needs,
and I couldn’t more strongly recommend them.
They. Just. Work.

Mike
AI7HP

Very good job, Mike!
Dr. Jack, COMPACtenna

SCANNER RECEIVE RADIO

COMPACtenna: model SCAN-III

From eHam.net :

PICKUP TRUCKS

[See INSTALLS Page for Pickup Truck mounting considerations.]

BASE STATION

Create a powerful yet small Base Station Antenna,

**using the CompacCounterpoise Optimized Base Station Ground Plane**

paired with a COMPACtenna 7.5″ or 9″ model Mobile Antenna.

Fits almost anywhere, and stealthy.

This Ground Plane Radials System is designed to work well at all bands in its specified frequency range.
The designated band(s) of the antenna mounted to it determines the end-results.

Models:
CompacCounterpoise (UHF-Female/SO-239 conn. for PL-259/UHF-Male terminated Coaxial Lead – 144-512 MHz)
CompacCounterpoise-N (N-Female conn. for N-Male terminated Coaxial Lead – 144-1000 MHz)

Base Station COMPACtenna on CompacCounterpoise DEMO by Eric Hofer, KJ4YZI – Ham Radio Concepts YouTube Link

HOA:

Seth J.
in hilly Tulsa, OK

I bought an ICOM 2730a and power supply,
then coupled them with 25’ of RG-8X to the 7.5” COMPACtenna mobile antenna
**on the COMPACtenna CompacCounterpoise base station radials ground plane system
atop 10’ of 1-1/4” PVC conduit that is propped up in the corner of my fence,
in a wisteria bush (HOA camo).**

I have gotten reports back that folks are amazed that I can clearly hit repeaters 41 miles away.

Can you see this HOA small inconspicuous yet Powerful antenna?? :

John & Eileen Whitesell of Oklahoma were using a J-Pole antenna on their porch, but had a high noise floor.

They switched to the COMPACtenna model 2M/440+ on CompacCounterpoise Ground Plane Radial Kit.

The unwanted RF noise went away, and they had much better desired signal even with forest penetration.

Jim Mac from NM Experiences with COMPACtenna Technology

With SDRplay RSPdx
Heard a repeater on 2 meters from Mount Lemon to Las Cruces 200 miles
The Caballo mountain range is around 6500 ft.

GMRS
Really good results.
I can hit a repeater using 5 watts that is about 50 miles away.

SWR
I am getting SWR’s of 1.2-1.6

I find all this this hard to believe, but can’t dispute the data.

Excellent, durable antenna.

**Reviews of CompacCounterpoise (Base Station Ground Plane for VHF/UHF NMO Mobile Antennas) on DX Engineering:**

10 Meter Band / CB Antennas

Models: ‘PERFECT 10’ / ‘PERFECT CB’

An optimized radio-antenna system is one with dedicated radios that operate on dedicated frequency bands with dedicated antennas in fixed installation.

COMPACtenna has optimized performance with dedicated CB (~69″) and 10-Meters (~65″) models.

Ultimate Performance!

LINKS to Specific Products

Click on model of interest, or scroll down to view all models and valuable information.

Ham Radio – VHF/UHF

2 Meters/440 (only 7.5″) (when 220 band isn’t needed – lower price – also for taller vehicle clearance)

2 Meters/440 + (Added Gain) (9″)

220 MAX (220MHz Band ONLY but Higher Gain) (9″)

Land Mobile Radio

Govt, Business, Marine, GMRS

Two Way Radio (Transmit & Receive)

Scanner Receive Radio

Antenna for Scanner Receive Radios

– – –

“Ultimate” VHF/UHF Ground Plane Radial Kit

For 7.5″ and 9″ NMO Mobile Antennas, as above

CompacCounterpoise & CompacCounterpoise-N

– – –

NMO Gasket & SuperLube Pack

– – – – – – –

CB – Citizens Band Radio

HAM – 10 Meters

Models: PERFECT CB and PERFECT 10 (also PERFECT 10/CB Replacement Stinger Whip)

Model SCAN-III

Scanner Receive Radio Antenna for NMO mounts

Broad elevation coordinate signal pattern and elliptical polarization of COMPACtenna provides stabilized signals in our common Non Line of Sight environments,

with temperature and humidity inversion pathways as well as tropospheric propagation, and satellite communications.

Product Name: COMPACtenna MADE IN THE USA Model: SCAN-III 9”

SCAN-III Compact High Performance SCANNER RECEIVE RADIO Antenna 100 – 1500 MHz
Including:
I. Civilian – VHF & UHF Air bands, Amateur Radio, Weather Channels, etc.
II. Commercial – Trucking, Dispatch, Railroad, Aeronautical, etc.
III. Government – Public Service-Safety/Local, State, Federal Govt/Military Frequency Bands
Police, Fire, Sheriff, Emergency Medical,
State Highway Patrol, Homeland Security, U.S. Federal, Military, Marine, Aircraft, etc.

Digital & Analog

Land Based and Satellite Communications

Antenna Type: Unique Electric/Magnetic Field Diversity Science & Technology Patented Design Patent No. US 9,407,001
With a special design construct of spiraled and cylindrical metal sheeting including ‘extended flat monofilar spiral Tesla-like coils’,
all resistance, inductance and capacitance (matching) is efficiently done by the physical metallic geometric form of the antenna itself,
as opposed to internal or external (lossy) components of other designs.
“Magnetic Field Resonator”: This built-in resonating matching system is an effectual component of the electromagnetic E & H fields production, resulting in better performance than expected for such a small antenna.
With a particularly strong magnetic near field, proximity noise is reduced.
And resulting diverse effective electromagnetic fields (elliptical polarization and phase diversity) as well as broad elevation coordinate signal pattern provides stabilized signals in our common Non-Line of Sight environments, with temperature and humidity inversion pathways & tropospheric propagation, and satellite communications, further enhancing performance in our world of (dynamic) obstructions, mitigating signal drops, reducing flutter, and increasing reliable range.

Reliable leaf spring style NMO connector on antenna for standard center-stud style NMO mounts
Best performance is generally seen when mounting at upper corners of a vehicle.
Signal pattern is substantially omnidirectional at corner locations, utilizing the downward/sloping metal of vehicle as counterpoise
METAL Ground Plane Vehicle Counterpoise – Apply antenna mount to metal with good (clean) ground connection;
Magnet mount type provides capacitive coupling, the ‘Flat’ style often provides best SWR’s

Mount types: see INSTALLS page
Only ~ 9” long x 1.5” dia.; 4 oz.
Each antenna manufactured is precisely tested/tuned before shipment.

Gain: Nominal 5(+) dB-MEG
[Due to properties listed above, performance is greater than predicted based on gain alone
in NLOS (Non-Line-Of-Sight) environments which is the world we live in.]

Base Station antenna
The SCAN-III may also be used as a high performance 100-1500 MHz compact base station Scanner Receive Radio antenna
by utilizing the COMPACtenna CompacCounterpoise, a heavy duty ground plane counterpoise radial kit
optimized for gain, pattern and SWR on VHF and UHF frequencies.
To reduce parasitic interaction, min. recommended height above ground and distance from RF-interacting materials is 10’; performance often escalates substantially 30’ (+) above ground.

Each Antenna is quality checked and tuned. Keep antenna and mount contacts clean. Fine grit emery cloth, for example, can remove oxidation. Thread lengths and center contact heights of different NMO mounts vary; make certain of good contact by antenna leaf spring – at times pulling the antenna leaf spring downward slightly is helpful before screwing antenna onto mount, especially if changing to another mount. Removing, re-attaching antenna(s) repeatedly is not recommended as a general rule; dedicated vehicle & base station systems are best. Use lube provided for NMO threads, the very bottom circular area of antenna (aluminum, plastic, and in-between), and both sides of gasket. Don’t cross-thread. Hand-tighten securely, don’t overtighten. The lube helps keep water out of antenna and mount, and reduces chance of cross-threading, galling and galvanic effect. Brushless car washes, hand washing reduce risk of antenna/mount damage. The antenna side screw is an added measure for secure physical integrity; it is to be left alone.
[Design and specifications subject to change without notice.]

From eHam.net :

By Bob Grove, W8JHD “The prediction of signal flutter reduction was true as well;

when annoying flutter interrupted reception of weak signals on the whip,

reception was much smoother with the COMPACtenna.”

Increased Reliable Range in the dynamically obstructed NLOS (Non Line Of Sight) Environment we live in.

*******

Mobile: For best performance, mount your COMPACtenna

at/near an upper corner of your vehicle.

See top of this Home Page and ‘INSTALLS’ page.

*******

SCAN-III Purchase

Link to COMPACtenna model SCAN-III at DX Engineering

Link to COMPACtenna model SCAN-III at Ham Radio Outlet

Available soon at DX Engineering affiliated dealers.

If interested in becoming a dealer of COMPACtenna Products,

contact COMPACtenna’s new exclusive master distributor: dxengineering@dxengineering.com

**Model 2M/220/440 Tri-Band**

Ham Radio 2-Meter + 220 + 440 Bands for NMO mounts

Broad elevation coordinate signal pattern and elliptical polarization of COMPACtenna provides stabilized signals in our common Non Line of Sight environments,

with temperature and humidity inversion pathways as well as tropospheric propagation, and satellite communications.

Product Name: COMPACtenna MADE IN THE USA Model: 2M/220/440 7.5”

Optimized Compact High Performance HAM Radio Antenna for 2 Meter + 220 + 440 Bands
Only ~ 7.5” long x 1.5” dia.; 4 oz.
Reliable leaf spring style NMO connector on antenna for standard center-stud style NMO mounts

“Magnetic Field Resonator”: This built-in resonating matching system is an effectual component of the electromagnetic E & H fields
production, resulting in better performance than expected for such a small antenna.
With a particularly strong magnetic near field, proximity noise is reduced.
And resulting diverse effective electromagnetic fields (elliptical polarization and phase diversity) as well as broad elevation coordinate
signal pattern provides stabilized signals in our common Non-Line of Sight environments, with temperature and humidity inversion
pathways & tropospheric propagation, and satellite communications, further enhancing performance
in our world of (dynamic) obstructions, mitigating signal drops, reducing flutter, and increasing reliable range.

Each antenna manufactured is precisely tested/tuned before shipment.

System Applications:
Digital & Analog VHF Amateur (HAM) Radio
Digital & Analog 220 Band Amateur (HAM) Radio
Digital & Analog UHF Amateur (HAM) Radio

Broad elevation coordinate signal pattern and elliptical polarization of COMPACtenna provides stabilized signals
in our common Non Line of Sight environments, with temperature and humidity inversion pathways
as well as tropospheric propagation, and SATELLITE communications.

Maximum Power Ratings – under normal use and conditions
2 Meter Band: 120 Watts SSB voice, 85 Watts FM-Digital voice, 60 Watts AM voice, 40 Watts Digital Data modes
220 Band: 60 Watts SSB voice, 30 Watts FM-Digital voice, 20 Watts AM voice, 15 Watts Digital Data modes
440 Band: 100 Watts SSB voice, 50 Watts FM-Digital voice, 35 Watts AM voice, 25 Watts Digital Data modes

Gain: Nominal 3(+) dB-MEG
Due to diverse EM Fields of the Magnetic Field Resonator, performance is greater than predicted
based on (singular polarization/peak gain) field-range/anechoic chamber gain studies alone,
in NLOS (Non-Line-Of-Sight) environments which is the world we live in.

(V)SWR: Nominal < 2:1 144-148 MHz; 222-225 MHz; 430-450 MHz
Best (V)SWR’s especially on VHF frequencies are generally seen when mounting at upper corners of a vehicle.

Signal pattern is substantially omnidirectional at corner locations, utilizing the downward/sloping metal of vehicle as counterpoise
METAL Ground Plane Vehicle Counterpoise – Apply antenna mount to metal with good (clean) ground connection;
Magnet mount type provides capacitive coupling, the ‘Flat’ style often provides best SWR’s

Mount types: see INSTALLS page
(V)SWR’s can vary with size & shape of vehicle & accessories; (V)SWR’s seen by the radio are often lower due to feed-line attenuation.

Always check SWR; operate only per transmitter/amplifier specifications.

Base Station antenna
This revolutionary antenna may also be used as a high performance compact base station antenna
by utilizing the COMPACtenna CompacCounterpoise, a heavy duty ground plane counterpoise radial kit
optimized for gain, pattern and SWR on VHF and UHF frequencies. To reduce parasitic interaction, min. recommended height above ground and distance from RF-interacting materials is 10’; performance often escalates substantially 30’ (+) above ground.

Each Antenna is quality checked and tuned. Keep antenna and mount contacts clean. Fine grit emery cloth, for example, may remove oxidation. Thread lengths and center contact heights of different NMO mounts vary; make certain of good contact by antenna leaf spring – at times pulling the antenna leaf spring downward slightly is helpful before screwing antenna onto mount, especially if changing to another mount. Removing, re-attaching antenna(s) repeatedly is not recommended as a general rule; dedicated vehicle & base station systems are best. Use lube provided for NMO threads, the very bottom circular area of antenna (aluminum, plastic, and in-between), and both sides of gasket. Don’t cross-thread. Hand-tighten securely, don’t overtighten. The lube helps keep water out of antenna and mount, and reduces risk of cross-threading, galling and galvanic effect. Brushless car washes, hand washing reduce risk of antenna/mount damage. The antenna side screw is an added measure for secure physical integrity; it is to be left alone.
[Design and specifications subject to change without notice.]

Scott Roberts, KB3CBC submitted a very well written report:

For one specific case: there is a venerable major manufacturer whose antennas are used by first responders and amateur radio operators (me) for decades. The particular antenna by this manufacturer is used on 2/70 and gave me a benchmark to compare the CompacTenna side by side. In urban, NLOS environments, the CompacTenna beat the 2/70 antenna in every case.

With regards to the magnetic vs electric fields: a fast but inaccurate translation would be to say that this antenna functions as an omnidirectional circularly polarized antenna, and if you didn’t know any better, that’s what you would hear on the radio and see from your reception and transmission reports. It’s a lot more complicated than that and would recommend you review the various YouTube videos Dr. Jack put together to address this topic. Antenna analyzers and plots only give you part of the story, primarily based upon the E-field. It doesn’t show you, directly, what’s happening from the H-field side. Use a spectrum analyzer to compare received signals, though, and you’ll see the difference. The noise floor was reduced by approximately 3db and the signals were more evenly distributed. Signals that were close to the noise floor were observed to have increased by 3-6db, and stronger signals were slightly attenuated. The result is that there was minimal fading and the capability to hear signals that I could not using other manufacturer’s antennas.

Digital Communications – DMR Radio with COMPACtenna Science & Technology (eHam.net):

Thank you, Carlos.

6 Minute Video of Tom Medlin of W5KUB.com Interviewing Dr. Jack Nilsson Regarding 7″ COMPACtenna Model 2M/220/440

– – –

Testimonial:

Our company “Ham and HiFi” purchased a Compactenna 2M/220/440 antenna from HRO recently!
We use the antenna for testing radios we acquire from ” ham radio collections” we purchase from all over the US !
The construction of our shop / warehouse is with foil backed insulation, steel doors and steel roof
which have made using inside antennas a problem …..
But when using the Compactenna I’m now able to connect to repeaters through out the Reno / Sparks area!
Easy to install, easy to use ( no tuning ), wide banded and will handle 85 watts on 2, 50 watts on 220 / 440 !
Best of all a small footprint and it works ! I ordered another for my truck !
Regards, Don W7SSB
HAMandHiFi.com

COMPACtenna Science & Technology – Superior Earth Communications (Land Mobile), Satellite, etc.:

Satellite Communication with COMPACtenna Science & Technology

Summary of comments on Groups.io by Brad Smith, KC9UQR:

Brad Smith, KC9UQR
I use the COMPACtenna model 2M/440.
It is elliptically polarized and a very good satellite antenna.
It does work better than a vertical.
I have tried many antennas, including 1/4, 1/2, and 5/8 wave verticals and an eggbeater.
Dr. Nilsson explained the elliptical polarization.
I am very impressed by this little antenna.
The website is COMPACtenna.com .
There is a lot of info there, including videos by Dr. Nilsson that are informing.
The COMPACtenna is also very good at high elevations/working directly overhead. …there is no “doughnut hole”.
The proof is when you get out into the field and make a contact and I am doing that every day.

By Bob Grove, W8JHD “The prediction of signal flutter reduction was true as well;

when annoying flutter interrupted reception of weak signals on the whip,

reception was much smoother with the COMPACtenna.”

Increased Reliable Range in the dynamically obstructed NLOS (Non Line Of Sight) Environment we live in.

‘Scotty D’ on YouTube

COMPACtenna, a game changer, shaking up the industry as the leader and expert in small powerful (mobile) radio antennas.

Full unboxing, setup and review of the COMPACtenna 2M/220/440 Tri-Band Mobile Antenna – YouTube Link

*******

Mobile: For best SWR and performance, mount your COMPACtenna

at/near an upper corner of your vehicle.

See top of this Home Page and ‘INSTALLS’ page.

*******

2M/220/440 Purchase

Link to COMPACtenna model 2M/220/440 at DX Engineering

Link to COMPACtenna model 2M/220/440 at Ham Radio Outlet

Available soon at DX Engineering affiliated dealers.

If interested in becoming a dealer of COMPACtenna Products,

contact COMPACtenna’s new exclusive master distributor: dxengineering@dxengineering.com

**Model 2M/440 Dual-Band**

Ham Radio 2-Meter + 440 Bands for NMO mounts

Broad elevation coordinate signal pattern and elliptical polarization of COMPACtenna provides stabilized signals in our common Non Line of Sight environments,

with temperature and humidity inversion pathways as well as tropospheric propagation, and satellite communications.

Product Name: COMPACtenna MADE IN THE USA Model: 2M/440 7.5”

Optimized Compact High Performance HAM Radio Antenna for 2 Meter + 440 Bands
Only ~ 7.5” long x 1.5” dia.; 4 oz.
Reliable leaf spring style NMO connector on antenna for standard center-stud style NMO mounts

Antenna Type: Unique Electric/Magnetic Field Diversity Science & Technology Patented Design Patent No. US 9,407,001
With a special design construct of spiraled and cylindrical metal sheeting including ‘extended flat monofilar spiral Tesla-like coils’,
all resistance, inductance and capacitance (matching) is efficiently done by the physical metallic geometric form of the antenna itself,
as opposed to internal or external (lossy) components of other designs.
“Magnetic Field Resonator”: This built-in resonating matching system is an effectual component of the electromagnetic E & H fields
production, resulting in better performance than expected for such a small antenna.
With a particularly strong magnetic near field, proximity noise is reduced.
And resulting diverse effective electromagnetic fields (elliptical polarization and phase diversity) as well as broad elevation coordinate
signal pattern provides stabilized signals in our common Non-Line of Sight environments, with temperature and humidity inversion
pathways & tropospheric propagation, and satellite communications, further enhancing performance
in our world of (dynamic) obstructions, mitigating signal drops, reducing flutter, and increasing reliable range.

Each antenna manufactured is precisely tested/tuned before shipment.

System Applications:
Digital & Analog VHF Amateur (HAM) Radio
Digital & Analog UHF Amateur (HAM) Radio

Maximum Power Ratings – under normal use and conditions
2 Meter Band: 120 Watts SSB voice, 85 Watts FM-Digital voice, 60 Watts AM voice, 40 Watts Digital Data modes
440 Band: 100 Watts SSB voice, 50 Watts FM-Digital voice, 35 Watts AM voice, 25 Watts Digital Data modes

(V)SWR: Nominal < 2:1 144-148 MHz; 430-450 MHz
Best (V)SWR’s especially on VHF frequencies are generally seen when mounting at upper corners of a vehicle.
Signal pattern is substantially omnidirectional at corner locations, utilizing the downward/sloping metal of vehicle as counterpoise
METAL Ground Plane Vehicle Counterpoise – Apply antenna mount to metal with good (clean) ground connection;
Magnet mount type provides capacitive coupling, the ‘Flat’ style often provides best SWR’s

Mount types: see INSTALLS page
(V)SWR’s can vary with size & shape of vehicle & accessories; (V)SWR’s seen by the radio are often lower due to feed-line attenuation.

Always check SWR; operate only per transmitter/amplifier specifications.

Brad Leeser, KEØLDS North Dakota
Report on COMPACtenna 7” model 2M/440

Dodge Durango
2 meter & 70 cm Bands tested
Analog & Digital
Yaesu – System Fusion – C4FM 4-level FSK

I had been using a ‘tall’ 2 meter/440 Ham Radio antenna on the center of the roof of my Dodge Durango.
But I moved and the new garage has a low clearance that will not allow standard antennas/technology.

It works great around town in Fargo, North Dakota.
I put the antenna on the rear left side of my car as recommended.
I’ve used it on the 2 meter and 70 cm bands
and have done both analog and digital System Fusion transmissions.
So far…two thumbs up.
And I have a four-inch clearance getting into my garage!
[So a ¼ wave 2 meter antenna wouldn’t even fit.]
BTW it was -21 degrees this morning in Fargo. and the antenna worked great!

As a follow up, I completed my 300 mile trip last week
from Fargo, North Dakota to Rochester, Minnesota.
I knew roughly how far the repeaters reached as I traveled along I-94 with my old tall antenna.
I am happy to report that my new 7” COMPACtenna had the same reach to those repeaters
as my old tall antenna.
I was picking up and reaching the repeater as far as 30 and more miles away,
which in hilly Minnesota country is not bad at all.

So, overall, I give the antenna a “two thumbs up”.
I think I made a really good buy.

Brad Leeser
KEØLDS

Non-Line-Of- Sight – Success with COMPACtenna

Simplex – Vehicle to Vehicle

I purchased one of your dual band COMPACtenna’s for my wife’s van.
She has 12 inches of clearance into our garage,
so we had to use a low profile antenna.
This evening, she and I talked on my drive home from work on 2 meter simplex.
We live in north western Michigan in a hilly region.
My wife was parked below the
level of the street that runs past our house.

As you can see in the attached Google Earth map, the hills
are over 200 feet higher in elevation than where my wife was parked.
We were both surprised on
How clear the signal came through.
In the past, we had a difficult time maintaining contact…

Thank you for making the COMPACtenna.

David Bolduc – N8ATP

By Bob Grove, W8JHD “The prediction of signal flutter reduction was true as well;

when annoying flutter interrupted reception of weak signals on the whip,

reception was much smoother with the COMPACtenna.”

Increased Reliable Range in the dynamically obstructed NLOS (Non Line Of Sight) Environment we live in.

*******

Mobile: For best SWR and performance, mount your COMPACtenna

at/near an upper corner of your vehicle.

See top of this Home Page and ‘INSTALLS’ page.

*******

2M/440 Purchase

Link to COMPACtenna model 2M/440 at DX Engineering

Link to COMPACtenna model 2M/440 at Ham Radio Outlet

Available soon at DX Engineering affiliated dealers.

If interested in becoming a dealer of COMPACtenna Products,

contact COMPACtenna’s new exclusive master distributor: dxengineering@dxengineering.com

**Model LMR-I Land Mobile Radio**

Government and Commercial Communications Marine GMRS MURS

For NMO Mounts

Broad elevation coordinate signal pattern and elliptical polarization of COMPACtenna provides stabilized signals in our common Non Line of Sight environments,

with temperature and humidity inversion pathways as well as tropospheric propagation, and satellite communications.

Product Name: COMPACtenna MADE IN THE USA Model: LMR-I 9”

Compact High Performance Land Mobile Radio Antenna for Public Service-Safety Govt, Commercial-Business, Marine, GMRS, MURS

Only ~ 9” long x 1.5” dia. Reliable leaf spring style NMO connector on antenna for standard center-stud style NMO mounts. Wt. 4 oz.

Optimized for 3 Wide Frequency Bands: VHF UHF 750-960 MHz
See SWR specifications below for vehicle use & separately when used with the CompacCounterpoise-N for Base Station application.

Digital & Analog
Police, Fire, Sheriff, Emergency Medical, State Highway Patrol, Homeland Security, U.S. Federal, Military
Business-Commercial, Marine, GMRS, MURS
The LMR-I antenna is a great fit for full spectrum as well as their mono-band Motorola, L3Harris, EFJohnson, Raytheon, and TAIT radios.

Each antenna manufactured is precisely tested/tuned before shipment.
High Performance low profile vehicle antenna. Also excellent for Base Station / Repeater use particularly with installations below 100-150’ above ground / HAAT – where Non-Line-of-Sight NLOS propagation is more substantial

With a particularly strong magnetic near field, proximity noise is reduced.

And resulting diverse effective electromagnetic fields (elliptical polarization and phase diversity) as well as broad elevation coordinate signal pattern provides stabilized signals in our common Non-Line of Sight environments, with temperature and humidity inversion pathways & tropospheric propagation, and satellite communications, further enhancing performance in our world of (dynamic) obstructions, mitigating signal drops, reducing flutter, and increasing reliable range.

Maximum Power Ratings – under normal use and conditions
VHF: 220 Watts SSB voice, 110 Watts FM-Digital voice, 70 Watts AM voice, 50 Watts Digital Data modes
Higher frequencies: 150 Watts SSB voice, 75 Watts FM-Digital voice, 50 Watts AM voice, 35 Watts Digital Data modes

Gain: Nominal 5(+) dB-MEG
Due to diverse EM Fields of the Magnetic Field Resonator, performance is greater than predicted
based on (singular polarization/peak gain) field-range/anechoic chamber gain studies alone,
in NLOS (Non-Line-Of-Sight) environments which is the world we live in.

(V)SWR: nominal <2:1 [MHz] 148-174, 400-512MHz, 750-960MHz; <2.5:1 144-148, 390-400; <3:1 136-144, 378-390

Best (V)SWR’s especially on VHF frequencies are generally seen when mounting at upper corners of a vehicle.
Signal pattern is substantially omnidirectional at corner locations, utilizing the downward/sloping metal of vehicle as counterpoise
METAL Ground Plane Vehicle Counterpoise – Apply antenna mount to metal with good (clean) ground connection;
Magnet mount type provides capacitive coupling, the ‘Flat’ style often provides best SWR’s

Mount types: see INSTALLS page
(V)SWR’s can vary with size & shape of vehicle & accessories; (V)SWR’s seen by the radio are often lower due to feed-line attenuation.

Always check SWR; operate only per transmitter/amplifier specifications.

Base Station antenna
This revolutionary antenna may also be used as a high performance compact base station/repeater antenna
by utilizing the COMPACtenna CompacCounterpoise-NFemale, a heavy duty ground plane counterpoise radial kit
optimized for gain, pattern and SWR on VHF and UHF frequencies; (V)SWR: nominal <2:1 150-162MHz, 430-470MHz, 750-960MHz.
To reduce parasitic interaction, min. recommended height above ground and distance from RF-interacting materials is 10’; performance often escalates substantially 30’ (+) above ground.

DX Engineering Customer Review:

[below from eHam.net]

Link to YouTube Video:

‘Motorola Jim’ shares his findings on the Land Mobile Radio -Government Communications- LMR-I (24 min.)

8.1.2025

Mike, AI7HP and his group in the state of Washington are involved in commercial

Land Mobile Radio (LMR) as well as ham radio.

They have much experience with COMPACtenna and Mike wrote:

The COMPACtennas we have purchased and use:

10 LMR-I antennas for both mobile and base mode
4 2M/220/440 antennas, one in base mode, the others in mobile mode
4 2 Meter/440+ antennas, one in base mode, the others in mobile mode

Commercial Land Mobile Radio (LMR) System:

About a year ago we installed a licensed commercial radio network in the eastern King County area of Washington. There are three base stations 28 miles away from each other, each with a COMPACtenna LMR-I antenna on a CompacCounterpoise Base Station Radials System only about 30’ above ground, yet covering an impressive wide area that spreads out about 40 miles east and west. We use the Anytone 578/878 Plus system in commercial mode with one as a 578 Single Frequency Repeater. The Anytone 578/878 radios are primarily digital DMR with security built in.

The reasons we decided on the Compactenna LMR-I antennas for the commercial system are:
Bandwidth, and the Performance Gain, Period.

As mobile antennas, and as repeater antennas on the COMPACtenna CompacCounterpoise Base Station Radials System, they are exceptional.

HOA – Commercial and Ham Radio:

I use COMPACtenna models LMR-I, 2M/220/440 and 2M/440+,
each on a COMPACtenna CompacCounterpoise Base Station Radials System.
The results are superb.

Mobile Ham Radio:

I’ve been using the Compactenna model 2M/220/440 antenna
on my personal vehicles for years.
Signal reports have ALL been very positive, even at 60+ miles away.
People are “shocked” with the clarity and range, Transmit & Receive.

Some operators have told me COMPACtenna Technology is just Snake Oil, an expensive scam,
or that the antennas could never perform like a whip.
ALL FALSE.
The Compactenna Technology LMR-I and Ham Radio antennas perfectly meet our needs,
and I couldn’t more strongly recommend them.
They. Just. Work.

Mike
AI7HP

Very good job, Mike!
Dr. Jack, COMPACtenna

*******

Mobile: For best SWR and performance, mount your COMPACtenna

at/near an upper corner of your vehicle.

See top of this Home Page and ‘INSTALLS’ page.

*******

LMR-I Purchase

Link to COMPACtenna model LMR-I at DX Engineering

Link to COMPACtenna model LMR-I at Ham Radio Outlet

Available soon at DX Engineering affiliated dealers.

If interested in becoming a dealer of COMPACtenna Products,

contact COMPACtenna’s new exclusive master distributor: dxengineering@dxengineering.com

CompacCounterpoise

Sturdy, Optimized Signal (Gain & Elevation Coordinate Pattern)/SWR VHF/UHF Base Station Ground Plane Radial Kit

model: CompacCounterpoise ..for PL-259 terminated coaxial feedline (144-512MHz)

model: CompacCounterpoise-N ..for N-Male terminated coaxial feedline (144-1,000MHz)

For All COMPACtenna vehicle antenna models

including 2M/440+ (PLUS), 2M/440, 2M/220/440, SCAN-III, LMR-I

[also works well with many other NMO VHF/UHF antennas]

Broad elevation coordinate signal pattern and elliptical polarization of COMPACtenna

provides stabilized signals in our common Non Line of Sight multi-path environments,

with temperature and humidity inversion pathways as well as tropospheric propagation,

and with satellite communications.

This Ground Plane Radials System is designed to work well at all bands in its specified frequency range.
The designated band(s) of the antenna mounted to it determines the end-results.

Product Name: COMPACtenna MADE IN THE USA CompacCounterpoise

Models: CompacCounterpoise (UHF-Female/SO-239 conn. for PL-259/UHF-Male terminated Coaxial Lead – 144-512 MHz)
CompacCounterpoise-N (N-Female conn. for N-Male terminated Coaxial Lead – 144-1000 MHz)

Optimized Heavy Duty Ground Plane Counterpoise for VHF & UHF

Heavy duty ground plane counterpoise radial kit optimized for gain, pattern and SWR on VHF & UHF for
COMPACtenna models 2M/440, 2M/220/440, 2M/440+, 220 MAX, LMR-I, and SCAN-III.
[Also works well with many other brands of NMO style vehicle antennas]

Frequency of operation dependent on vehicle NMO antenna utilized

Digital & Analog

Broad elevation coordinate signal pattern and elliptical polarization of COMPACtenna is excellent
particularly with installations below 100-150’ above ground / HAAT where Non-Line-of-Sight NLOS propagation is more substantial.

Easy installation; much of unit is pre-assembled
18” elements to ~3” diameter plate attachment; elements optimally angled in factory at 45 degrees below the horizon
Assembled: 13” H x 29” W x 29” D; 14 oz.
Plate has NMO mount above
Stainless steel hose clamps provided allow for 1 ¼ “ – 1 ¾ ” OD mast/pipe

Maximum Power Rating: 200 Watts up to 225 MHz, 100 Watts at higher frequencies
under normal use and conditions [Note also specifications of antenna used.]

Gain: Nominal 3(+) dBi / 3-5(+) dB-MEG with COMPACtenna Vehicle Antenna attached
Due to diverse EM Fields of the Magnetic Field Resonator, performance is greater than predicted
based on (singular polarization/peak gain) field-range/anechoic chamber gain studies alone,
in NLOS (Non-Line-Of-Sight) environments which is the world we live in.

(V)SWR: nominal <2:1, range 144 – 512 MHz for -SO239 model, 144-1000 MHz for -N model
Specific frequencies depending on vehicle antenna utilized
(V)SWR’s (and pattern) are affected by surrounding (metal) structures
(V)SWR’s seen by the radio are often lower due to coaxial/feed-line attenuation.

Always check SWR; operate only per transmitter/amplifier specifications.

To reduce parasitic interaction, min. recommended height above ground and distance from RF-interacting materials is 10’; performance often escalates substantially 30’ (+) above ground.

Each Antenna is quality checked and tuned. Keep antenna and mount contacts clean. Fine grit emery cloth, for example, can remove oxidation. Thread lengths and center contact heights of different NMO mounts vary; make certain of good contact by antenna leaf spring – at times pulling the antenna leaf spring downward slightly is helpful before screwing antenna onto mount, especially if changing to another mount. Removing, re-attaching antenna(s) repeatedly is not recommended as a general rule; dedicated vehicle & base station systems are best. Use lube provided for NMO threads, the very bottom circular area of antenna (aluminum, plastic, and in-between), and both sides of gasket. Don’t cross-thread. Hand-tighten securely, don’t overtighten. The lube helps keep water out of antenna and mount, and reduces chance of cross-threading, galling and galvanic effect.
Also, lube on stainless steel screws/nuts threads can mitigate galling.
[Design and specifications subject to change without notice.]

QST (ARRL) August, 2022: COMPACtenna Model 2M/440+, mobile and on CompacCounterpoise

John & Eileen Whitesell of Oklahoma were using a J-Pole antenna on their porch, but had a high noise floor.

They switched to the COMPACtenna model 2M/440+ on CompacCounterpoise Ground Plane Radial Kit.

The unwanted RF noise went away, and they had much better desired signal even with forest penetration.

Reviews by DX Engineering customers utilizing the CompacCounterpoise:

Base Station COMPACtenna on CompacCounterpoise DEMO by Eric Hofer, KJ4YZI – Ham Radio Concepts YouTube Link

*******

See ‘INSTALLS’ page.

*******

CompacCounterpoise (SO-239) Purchase

Link to model CompacCounterpoise at DX Engineering

Link to model CompacCounterpoise at Ham Radio Outlet

CompacCounterpoise-N Purchase

Link to model CompacCounterpoise-N at DX Engineering

Link to model CompacCounterpoise-N at Ham Radio Outlet

Available soon at DX Engineering affiliated dealers.

If interested in becoming a dealer of COMPACtenna Products,

contact COMPACtenna’s new exclusive master distributor: dxengineering@dxengineering.com

Model 2M/440+

**All the high performance of the 7.5” model 2M/440, PLUS an additional 1.5dB of gain*,**

and greater power handling capacity.

It is for those where 9″ is allowable/desirable and the operator wants that extra ‘edge’.

* These lengths (7.5″, 9″) are along the exponential portion of the curve of gain increase

for a shortened monopole:

Ham Radio 2-Meter + 440 Bands for NMO mounts

Broad elevation coordinate signal pattern and elliptical polarization of COMPACtenna provides stabilized signals

in our common Non Line of Sight environments,

with temperature and humidity inversion pathways as well as tropospheric propagation, and satellite communications.

Product Name: COMPACtenna MADE IN THE USA Model: 2M/440+ 9”

Optimized Compact High Performance HAM Radio Antenna for 2 Meter + 440 Bands

The 2M/440+ : All the high performance of the 7.5” model 2M/440, PLUS an additional ~1.5dB of gain, and greater power handling capacity. Designed for those where this ~ 9″ long x 1.5” dia. model is allowable/desirable and the operator wants that extra ‘edge’. Wt. 4 oz.

Reliable leaf spring style NMO connector on antenna for standard center-stud style NMO mounts

Antenna Type: Unique Electric/Magnetic Field Diversity Science & Technology Patented Design Patent No. US 9,407,001
With a special design construct of spiraled and cylindrical metal sheeting including ‘extended flat monofilar spiral Tesla-like coils’,
all resistance, inductance and capacitance (matching) is efficiently done by the physical metallic geometric form of the antenna itself,
as opposed to internal or external (lossy) components of other designs.
“Magnetic Field Resonator”: This built-in resonating matching system is an effectual component of the electromagnetic E & H fields production, resulting in better performance than expected for such a small antenna.
With a particularly strong magnetic near field, proximity noise is reduced.
And resulting diverse effective electromagnetic fields (elliptical polarization and phase diversity) as well as broad elevation coordinate signal pattern provides stabilized signals in our common Non-Line of Sight environments, with temperature and humidity inversion pathways & tropospheric propagation, and satellite communications, further enhancing performance in our world of (dynamic) obstructions, mitigating signal drops, reducing flutter, and increasing reliable range.
Each antenna manufactured is precisely tested/tuned before shipment.

System Applications:
Digital & Analog VHF Amateur (HAM) Radio
Digital & Analog UHF Amateur (HAM) Radio

Maximum Power Ratings – under normal use and conditions
2 Meter Band: 200 Watts SSB voice, 100 Watts FM-Digital voice, 65 Watts AM voice, 50 Watts Digital Data modes
440 Band: 150 Watts SSB voice, 75 Watts FM-Digital voice, 50 Watts AM voice, 35 Watts Digital Data modes

Mount types: see INSTALLS page
(V)SWR’s can vary with size & shape of vehicle & accessories; (V)SWR’s seen by the radio are often lower due to feed-line attenuation.

Always check SWR; operate only per transmitter/amplifier specifications.

Reduced Flutter and Increased Reliable Range in the Dynamic Obstructed Multi-Path NLOS (Non Line Of Sight) Environment we live in is made possible

by the Diverse Electromagnetic Fields of The Magnetic Field Resonator constructed of ‘extended flat monofilar spiral Tesla-like coils’ + geometric components.

This New Science & Technology 9″ Model can ALSO Dominate Performance of much longer standard antenna technology in Long Range LOS – Line of Sight Communications!

from eHam.net:

Talking THROUGH DIRT – by Dr. Marc (NM0D), Rosemary (KE5CMS) & Brett (KI5TAX)

Base Station COMPACtenna MODEL 2M/440+ on CompacCounterpoise DEMO by Eric Hofer, KJ4YZI – Ham Radio Concepts YouTube Link

*******

Mobile: For best SWR and performance, mount your COMPACtenna

at/near an upper corner of your vehicle.

See top of this Home Page and ‘INSTALLS’ page.

*******

2M/440+ Purchase

Link to COMPACtenna model 2M/440+ at DX Engineering

Link to COMPACtenna model 2M/440+ at Ham Radio Outlet

Available soon at DX Engineering affiliated dealers.

If interested in becoming a dealer of COMPACtenna Products,

contact COMPACtenna’s new exclusive master distributor: dxengineering@dxengineering.com

**Model 220MAX Ultimate 220MHz Antenna**

Product Name: COMPACtenna MADE IN THE USA Model: 220 MAX 9”

Optimized Compact High Performance HAM Radio Antenna for the 220MHz (1.25m) Band

The 220 MAX : Maximum Gain, Higher Power Handling, Low SWR
Designed for those where this ~ 9″ long x 1.5” dia. model is allowable/desirable and the operator wants that extra ‘edge’. Wt. 4 oz.

Reliable leaf spring style NMO connector on antenna for standard center-stud style NMO mounts

With a particularly strong magnetic near field, proximity noise is reduced.

And resulting diverse effective electromagnetic fields (elliptical polarization and phase diversity) as well as broad elevation coordinate signal pattern provides stabilized signals in our common Non-Line of Sight environments, with temperature and humidity inversion pathways & tropospheric propagation, and satellite communications, further enhancing performance
in our world of (dynamic) obstructions, mitigating signal drops, reducing flutter, and increasing reliable range.

Each antenna manufactured is precisely tested/tuned before shipment.

System Applications:
Digital & Analog Amateur (HAM) Radio

Maximum Power Ratings – under normal use and conditions
100 Watts SSB voice, 65 Watts FM-Digital voice, 45 Watts AM voice, 30 Watts Digital Data modes

(V)SWR: Nominal < 2:1 222-225 MHz
Best (V)SWR’s especially on VHF frequencies are generally seen when mounting at upper corners of a vehicle.
Signal pattern is substantially omnidirectional at corner locations, utilizing the downward/sloping metal of vehicle as counterpoise
METAL Ground Plane Vehicle Counterpoise – Apply antenna mount to metal with good (clean) ground connection;
Magnet mount type provides capacitive coupling, the ‘Flat’ style often provides best SWR’s

Mount types: see INSTALLS page
(V)SWR’s can vary with size & shape of vehicle & accessories; (V)SWR’s seen by the radio are often lower due to feed-line attenuation.

Always check SWR; operate only per transmitter/amplifier specifications.

*******

Mobile: For best SWR and performance, mount your COMPACtenna

at/near an upper corner of your vehicle.

See top of this Home Page and ‘INSTALLS’ page.

*******

220 MAX Purchase

Link to COMPACtenna model 220 MAX at DX Engineering

Link to COMPACtenna model 220 MAX at Ham Radio Outlet

Available soon at DX Engineering affiliated dealers.

If interested in becoming a dealer of COMPACtenna Products,

contact COMPACtenna’s new exclusive master distributor: dxengineering@dxengineering.com

Models: PERFECT CB and PERFECT 10

An optimized radio-antenna system is one with dedicated radios that operate on dedicated frequency bands with dedicated antennas in fixed installation.

COMPACtenna has optimized performance with dedicated CB (~69″) and 10-Meters (~65″) models.

DX Engineering customer review:

1/2 minute YouTube Eric Hofer of HamRadioConcepts

Model: PERFECT CB

CB Perfected with model ‘PERFECT CB’ – Ultimate CB Performance!

Novel Engineering
Quality Machining & Skillfully Hand-Crafted
Each antenna is precisely tested/tuned in THE USA.

Vehicle application: Mount on vehicle at a sensible location appropriately.
A variety of 3/8”-24 thread sturdy mount types are available on the market.

See INSTALLS page of COMPACtenna.com .
SWR frequency range varies with vehicle construct, and where on the vehicle the antenna is mounted.
Keep antenna substantially above nearby metal, limit horizontally adjacent near field parasitic interaction.

Base Station application: Mount antenna on a sufficient appropriate ground plane counterpoise.
Possible installations include magnet/clamp/bracket mounting on house/shed/building metal roofs (upper area), well supported metal gutter/trim, a metal railing.

See HOME and INSTALLS pages of COMPACtenna.com .
A general rule is that expansive [8’(+)] metal in at least one horizontal/angled somewhat downward direction can yield a reasonable SWR. [Mounting simply to a vertical mast typically does not.]
Height above ground affects signal pattern, and SWR.
Keep antenna substantially above nearby metal/RF-interactive materials. Limit horizontally adjacent near field parasitic interaction, far field shadowing.
Outside installation is recommended to decrease noise from indoor switching power supplies and other electrical devices.

After viewing the rest of this page below, SEE INSTALLS PAGE (scroll down to PERFECT CB)

If creating a hole/holes is/are being considered, temporarily securing the mount (for vehicle application, not moving), or trying a magnet mount (on steel, magnetically secured; on aluminum, supported – capacitive coupling exists with both) or a clamp mount at/near the intended location, may help to give an idea of SWR before the hole(s) is/are made.

Always check SWR; operate only per transmitter specifications.

~69” tall – Tuning can be done by adjusting whip position in Ferrule, or trimming whip.

The frequency shifts ~0.1 MHz with ½” change in length; increase in length lowers freq.; decrease in length raises freq.

Use threadlocker on whip set screws after tuning is completed.

(V)SWR: Nominal < 2:1 [ Often 1.1-1.5:1 ]

Models PERFECT 10 & PERFECT CB are the same, except that the stinger whips are pre-cut for user convenience to 44 ½” for the PERFECT CB, 40 ½” for the PERFECT 10. The accessory ‘PERFECT 10/CB REPLACEMENT WHIP’ is 44 ½” long; trim if/as needed.

Wt. 1.5 lb.

Gain: Nominal 7(+) dB-MEG – Mean Effective Gain in the dynamic obstructed environments

of the world we live in, with COMPACtenna’s ‘PERFECT CB’ diverse EM (ElectroMagnetic) fields –

phase diversity in same and orthogonal polarizations-elliptical polarization

Maximum Power Ratings – under normal use and conditions
1500 Watts SSB voice; 750 Watts FM-Digital voice; 500 Watts AM voice; 250 Watts Digital Data modes

Under normal use and conditions

Each Antenna is quality checked and tuned. Keep antenna and mount contacts – area clean.
Removing, re-attaching antenna(s) repeatedly is not recommended as a general rule;
dedicated vehicle & base station systems are best.
[Design and specifications subject to change without notice.]

Eric Hofer of HamRadioConcepts adjusted the whip (‘stinger’) for SWR dip at the SSB frequencies Ch. 36-40,

and still has SWR’s <=1.3:1 across the entire CB Band:

Ham Radio Concepts – Eric Hofer – YouTube Channel Link

Paul from Texas sent a photo of his easy installation and writes:

I simply affixed the L-bracket of a standard mobile CB antenna mirror mount
on the end of my roof gutter with a standard vice grip.

This is the stealthy look and performance that I was looking for.

It’s working great!

SWR’s are 1:1 to 1:4 across 11 meters.

With my antenna mount on the gutter only about 10 feet above the ground,
I am talking with area locals 45+ miles away!
And I’ve been able to do DX as well all over the country.

Thank you!

Model: PERFECT 10

Ham Radio – 10 meters Perfected with model ‘PERFECT 10’ Ultimate Performance!

Novel Engineering
Quality Machining & Skillfully Hand-Crafted
Each antenna is precisely tested/tuned in THE USA.

Vehicle application: Mount on vehicle at a sensible location appropriately.
A variety of 3/8”-24 thread sturdy mount types are available on the market.

After viewing the rest of this page below, SEE INSTALLS PAGE (scroll down to PERFECT 10)

Always check SWR; operate only per transmitter specifications.

~65” tall – Tuning can be done by adjusting whip position in Ferrule, or trimming whip.

The frequency shifts ~0.1 MHz with ½” change in length; increase in length lowers freq.; decrease in length raises freq.

Use threadlocker on whip set screws after tuning is completed.

(V)SWR: Nominal < 2:1 [ Often 1.1-1.5:1 ]

Gain: Nominal 7(+) dB-MEG – Mean Effective Gain in the dynamic obstructed environments

of the world we live in, with COMPACtenna’s ‘PERFECT CB’ diverse EM (ElectroMagnetic) fields –

phase diversity in same and orthogonal polarizations-elliptical polarization

Maximum Power Rating: 1500 Watts SSB; 500 Watts AM; 250 Watts Digital

Under normal use and conditions

“The COMPACtenna PERFECT 10 had the best (V)SWR Results” :

“On-the-air performance revealed that the COMPACtenna PERFECT 10 and the 5′ Firestik were the best two of the four antennas tested;

further comparative analysis of these two models was accomplished with distinguishing audio recordings made at the receiving end.” :

There is less static with the PERFECT 10, with the desired audio more discernible.

Variations of the loaded shortened monopole style antenna have been exhaustively explored for decades in attempts at optimization.

It is quite an accomplishment in novel design to notably exceed performance of two of the three classic designs,

and be discernibly better than the best of the three!

YouTube link – 5 minute video of 10 Meter Band Antennas T&E by Christopher Allen, W4CJA ..assisted by K4DFX

**Stephen Kinford, N8WB * at HOME Making Contacts with The COMPACtenna PERFECT 10 Antenna – YouTube Link**

* Link to Stephen Kinford, Reporter at Amateur Radio Newsline

See ‘INSTALLS’ page for additional information.

Model: PERFECT 10/CB REPLACEMENT STINGER WHIP

COMPACtenna Antenna Models PERFECT 10 & PERFECT CB are the same,

except that the stinger whips are pre-cut for user convenience

to 44 ½” for the PERFECT CB, 40 ½” for the PERFECT 10.

This accessory ‘PERFECT 10/CB REPLACEMENT STINGER WHIP’ is 44 ½” long;

trim if/as needed.

PERFECT CB Purchase

Link to COMPACtenna model PERFECT CB at DX Engineering

Link to COMPACtenna model PERFECT CB at Ham Radio Outlet

PERFECT 10 Purchase

Link to COMPACtenna model PERFECT 10 at DX Engineering

Link to COMPACtenna model PERFECT 10 at Ham Radio Outlet

PERFECT 10/CB REPLACEMENT STINGER WHIP Purchase

Link to COMPACtenna model PERFECT 10/CB REPLACEMENT STINGER WHIP at DX Engineering Coming Soon

Available soon at DX Engineering affiliated dealers.

If interested in becoming a dealer of COMPACtenna Products,

contact COMPACtenna’s new exclusive master distributor: dxengineering@dxengineering.com

Model: CAPTURE BEAM-X

10dBi GAIN in a tiny size !! REVOLUTIONARY !!

This 2 Meter Band Beam Antenna comes Fully Assembled in a 30” x 20” x 12” Standard Shipping Box !!

Allowing easy installation in small spaces and restricted areas,
a creative design that looks great with Red, White & Blue colored materials, all UV-stable !!

Novel Engineering – Capture spatial variant and phase variant signals producing Enhanced Signal Stability !!

Quality Machining & Skillfully Hand-Crafted
Each antenna is precisely tested/tuned in THE USA.

This COMPACtenna Beam antenna includes the DX Engineering® ‘Genius Clamp’ allowing easy mounting to your mast,
and simple rotation of the antenna boom for vertical or horizontal polarization – polarization positions are marked on boom.
Stainless steel washers, lock washers, nuts and tap bolts are provided, don’t overtighten. 5” bolts allow a mast up to 1.75” OD.
[SuperLube packet is provided for stainless steel mounting screws-nuts assembly to mitigate risk of galling.]

A specialized tuning system allows for SWR<2:1 in any contiguous 3 MHz portion of the 2 meter band, 144-148 MHz.
Indicators for tuning system lug positions are marked on the antenna. [Surrounding RF-interactive materials can affect SWR.]
The CAPTURE BEAM-X is designed such that it may be by mounted at the top or side of a mast, RF-interactive or not type.

10dBi GAIN

Maximum Power Ratings – under normal use and conditions
600 Watts SSB voice, 300 Watts FM-Digital voice, 200 Watts AM voice, 150 Watts Digital Data modes
Note: 300 Watts with 10dBi Gain = 3,000 Watts EIRP !

29.5”H x 19.5”W x 11.75”D (boom length incl. rear mounting section!)
Antenna itself 5 lbs. (‘Genius Clamp’ 2 lbs.)

[Design and specifications subject to change without notice.]

CAPTURE BEAM-X Development / Beneficial Qualities / Purchase

Merging the beneficial characteristics of Yagi style and full loop style beam antennas/reflectors
with that of large sheet/mesh reflectors…

The initial concept revolved around the varied benefits and differences of a reflector such as in a Yagi antenna with a slightly greater than half-wave length reflector … and a full wave loop reflector element,
and the sheet or mesh reflector.

The large sheet or mesh reflector has a benefit of broader bandwidth, also capture of various multi-path signals.

The full wave loop or half wave Yagi Reflector is smaller, generally only about 1.05+/- times the length of the same-construct driven element,
but especially with small driven-to-reflector elements spacing, even with somewhat increased reflector length, suffers from substantial decrease in impedance, as well as greatly reduced bandwidth.

When considering those aspects, as well as the physics of the nearfield, midfield, and farfield, with the Niels Bohr quantum aspects of immediacy of interaction and the Einstein’ speed of light, and in meditating on it, I had the notion of combining the best of both to produce a very high gain antenna in a very small size.

The specifics of the geometry are unique.

The end result is that it works in terms of gain, and pattern!

Additionally is the beneficial quality of stabilizing of otherwise fluctuating signals with broad signal capture and phase diversity!

I then devised a customer-adjustable matching system that is very synergistic with the antenna design.
It is essentially a nice variant of the Delta match system.

FULLY ASSEMBLED EASY to USE

Many people struggle assembling beam antennas on the market.
This antenna is completely assembled and easy to use.

And it fits completely assembled in a standard shipping box!
EASY !

As an elite product, it also incorporates the DX Engineering Genius Clamp, which is made of sturdy stainless steel, and provides ease of mounting and ease of polarization change of the antenna by simple rotation of the antenna boom within the genius clamp.

Many details were devised to make this product so unique and so good, with high quality.

On-the-Air

The increase in desired signal strength is impressive with fantastic front-to-back (F/B) and front-to-side (F/S) ratios,
being able to ‘Zero-in’ on the signal desired and tremendously reduce the noise from other directions so effectively!

The reduction of noise from other directions is beneficial in outdoor installations, but also very much so in indoor installations where homes often produce significant RF noise!

I have had on the market 5’ to 30’ long Yagi antennas on 2 m, so I’m familiar with their effectiveness…
The tiny
CAPTURE BEAM-X
‘Packs a Punch’ !!!

Like the power of an amplifier and even more in many ways!

CAPTURE BEAM-X Purchase

Link to COMPACtenna model CAPTURE BEAM-X at DX Engineering

Available soon at DX Engineering affiliated dealers.

If interested in becoming a dealer of COMPACtenna Products,

contact COMPACtenna’s new exclusive master distributor: dxengineering@dxengineering.com

Gasket & SuperLube Pack

2 High Quality EPDM NMO Mount Gaskets (~1 1/16” I.D.; 1 1/2” O.D.)

2 High Quality SuperLube Packs

[NMO Mount not included]

Each Antenna is quality checked and tuned. Keep antenna and mount contacts clean. Fine grit emery cloth, for example, can remove oxidation. Thread lengths and center contact heights of different NMO mounts vary; make certain of good contact by antenna leaf spring – at times pulling the antenna leaf spring downward slightly is helpful before screwing antenna onto mount, especially if changing to another mount. Removing, re-attaching antenna(s) repeatedly is not recommended as a general rule; dedicated vehicle & base station systems are best. Use lube provided for NMO threads, the very bottom circular area of antenna (aluminum, plastic, and in-between), and both sides of gasket. Don’t cross-thread. Hand-tighten securely, don’t overtighten. The lube helps keep water out of antenna and mount, and reduces chance of cross-threading, galling and galvanic effect. Brushless car washes, hand washing reduce risk of antenna/mount damage. The antenna side screw is an added measure for secure physical integrity; it is to be left alone. Also, lube on stainless steel screws/nuts threads can mitigate galling.
[Design and specifications subject to change without notice.]

Gasket & SuperLube Pack Purchase

Link to COMPACtenna model Gasket & SuperLube Pack at DX Engineering

Available soon at DX Engineering affiliated dealers.

If interested in becoming a dealer of COMPACtenna Products,

contact COMPACtenna’s new exclusive master distributor: dxengineering@dxengineering.com

The manufacturer warrants this product to be free from defects in workmanship and materials, under
normal use and conditions, for a period of one (1) year for the original invoice date. Shipping
and handling fees are to be paid for by the customer. The manufacturer agrees, at its option during the
warranty period, to repair any defect in material or workmanship or to furnish a repaired or refurbished
product of equal value in exchange without charge (except for a fee for shipping, handling, packing,
return postage, and insurance which will be incurred by the customer). Such repair or replacement is
subject to verification of the defect or malfunction and proof of purchase as confirmed by showing the
model number on original dated sales receipt.

COMPACtenna

small HIGH PERFORMANCE Antennas

compact ANTENNAS

small Powerful Antennas

Ham Radio LMR – Land Mobile Radio (Govt, Business, Marine, GMRS) Scanner CB

Elite Antennas for Elite Radio-Antenna Systems

Unique High Performance Attractive

Patented Technology – Quality Machining & Skillfully Hand-Crafted

Each Antenna manufactured is Precisely Tested/Tuned before shipment.

MADE IN THE USA

Vehicle

7.5″, 9″ VHF/UHF models Often allowing passage into garages, drive-thru and below overhangs and branches

CB, 10 Meter models Ultimate performance

Home

For HOA’s, condo’s, apartments, homes

Examples:

7.5″, 9″ VHF/UHF models on CompacCounterpoise (see COMPACtenna’s optimized ground plane system below)

for attic, inconspicuous (“stealth”) roof installation, backyard mast/pole

2 Meter Band CAPTURE BEAM-X for indoor or outdoor use

CB, 10 Meter models on metal roof (upper part) of house/building/shed, or

well supported metal gutter/trim, metal railing

using a 3/8″-24 CB style magnet/clamp/bracket mount as appropriate

[Outside installation is recommended to decrease noise from indoor switching power supplies

and other electrical devices.]

Parks (POTA), Camp Grounds Field Emergency Deployment

[Follow local building codes including NEC grounding/lightning/etc. and NFPA guidelines.]

[Follow applicable RF-Exposure Regulations.]

[Professional Installation recommended.]

Links to Specific Products

Follows beneficial information

7.5″/9″ VHF/UHF Antennas

Models: 2M/440 2M/220/440 2M/440PLUS 220MAX LMR-I SCAN-III

Generally, best performance of a mobile antenna is achieved with location at the top of the vehicle.

Long antennas can be unsightly and often do not allow travel into garages, beneath underpasses,

and standard technology short antennas have significantly decreased performance and bandwidth.

The short (~7.5″/9″ models) yet powerful COMPACtenna

is designed for best results (SWR, Performance) at an UPPER CORNER of a vehicle.

After reading this ‘HOME’ page, see the helpful ‘INSTALLS’ page.

QST (ARRL) August, 2022:

“This COMPACtenna Invention by Dr. Jack Nilsson is the first real new development in antenna communication design since Marconi/Tesla,

a paradigm shift in thinking that works amazingly well.”

Dr. Marcus Durham, PhD Electronics Engineering, Life Fellow IEEE

NMOD, Amateur Extra

Greater Range overall in our real-world obstructed environment (buildings, hills, etc.)

Witnessed by Donald with simplex net test:

Patented COMPACtenna Revolutionary Design – small yet Powerful

With a special design construct of spiraled and cylindrical metal sheeting

including ‘extended flat monofilar spiral coils’, antenna efficiency is maximized

with all resistance, inductance and capacitance (matching) accomplished

by the physical metallic geometric form of the antenna itself,

as opposed to internal or external components of other designs

where there is loss, resistive and field-to-ground.

“Magnetic Field Resonator”: This built-in resonating matching system

is an effectual component of the electromagnetic E & H fields production,

resulting in better performance than expected for such a small antenna.

With a particularly strong magnetic near field, proximity noise is reduced.

And resulting diverse effective electromagnetic fields

further enhance performance in our world of (dynamic) obstructions,

mitigating signal drops, reducing flutter, and increasing reliable range.

Broad elevation coordinate signal pattern, phase shift of same polarization, as well as elliptical polarization of COMPACtenna,

provides stabilized VHF/UHF signals in our common Non Line of Sight environments,

with temperature and humidity inversion pathways as well as tropospheric propagation, satellite communications.

COMPACtenna Science & Technology increases the number of usable regional repeaters (and simplex stations) in common environments.

This is due to its Non-Line-Of-Sight capabilities.

The benefit applies to COMPACtenna on vehicles, as well as COMPACtenna with the CompacCounterpoise for base stations.

The 2018 Dayton International Hamvention – New product Showcase 5 minute Presentation by Dr. Jack Nilsson, Inventor – COMPACtenna, YouTube Link

COMPACtenna Quanta – Near & Far Fields – 1 Hr. Talk by Dr. Jack Nilsson, Inventor – COMPACtenna,

then 20 minute Q&A – Conejo Valley (CA) Amateur Radio Club 1.20.22 – YouTube Link

“…consistently strong signal …while he drove all the way to Rancho Santa Margarita, through areas that would otherwise produce marginal signals with a more common antenna. …

Resulting diverse effective electromagnetic fields are claimed to mitigate signal drops, reduce flutter, and increase reliable range, which Randy has confirmed.”

Newsletter Article – COMPACtenna Study – County of Orange, CA Radio Amateur Civil Emergency Service

Appreciation: County of Orange, CA Radio Amateur Civil Emergency Service – Ken Bourne, W6HK, OCRACES Chief Radio Officer, Randy Benicky, N6PRL

YouTube Link to Testing & Analysis of COMPACtenna vs. ‘Standard Tech. Antennas’ by Josh Nash of Ham Radio Crash Course

COMPACtenna Users say: it LASTS a LONG TIME – they LIKE the UPPER CORNER PLACEMENT – KNOWLEDGEABLE OPERATORS LOVE IT

Reception and Transmission Testing:

RECEIVE Test – COMPACtenna Reduces Flutter Even in Underground Tunnels – a 1 minute YouTube Shorts

TRANSMIT TEST – 12 Minute YouTube Video

KK4SBS

7.5″ model 2M/220/440

Not sure what sort of … magic wizardry you’ve pulled off here but the performance of the 70cm/1.25m/2m tri-band