COMPACtenna   …   COMPACT antenna


SMALL  antennas     NO  tuning  (of antenna structure)     SMALL  ground plane     HIGH  Performance

COMPACtenna requires a ground plane/counterpoise as other antennas, BUT LESS.
Allowing greater flexibility in installations/locations.

7″ & 9″ COMPACtennas
models 2M/220/440, 2M/440 & SCAN-III
With many antennas, the single center-of-roof placement (with no sunroof) is strongly encouraged.
All the corners of a vehicle roof/trunk lid are considered undesirable for these
‘standard technology’ antennas.
Not true with COMPACtenna Science & Technology…
Those many locations are actually very desirable for the COMPACtenna,
providing many appreciated options.
The COMPACtenna effectively utilizes the side-metal of the vehicle
(quarter-panels, fenders, pillars, doors) as a ~ ‘sloping’ counterpoise
allowing greater flexibility and ease for varieties of installations.

The center-of-roof location can cause reduced resistance due to the high voltage point of the antenna
being so close in a short antenna to extensive ground plane/counterpoise all around it,
and reduced performance.
But with substantial downward-projecting metal the resistance beneficially increases
with counterpoise signal enhancement effect
such that the numerous corner of roof/trunk locations
become excellent potential installation site choices.
[As a receiving antenna, model SCAN-III performs excellently at any position on metal roof/trunk lid/fender.]

7″ and 9″  MODELS

2M/220/440, 2M/440 and SCAN-III

VHF/UHF COMPACtenna models benefit from some downward-projecting
ground plane counterpoise metal for best impedance (V)SWR matching
at/near the corners of the vehicle roof or trunk.
[As a receiving antenna, model SCAN-III performs excellently at any position on metal roof/trunk lid/fender.]
Here are photos of the 7″/9″ models on NMO magnet mounts:
COMPACtenna Website 2M-(220-)440 & SCAN-III Vehicle Photos

COMPACtenna Installation 2M-220-440 Mount Types

with 7″ COMPACtennas at bottom of page. ***


Base Station Application

Base Station Antenna ground radials kits work very well with the VHF/UHF COMPACtennas
with the ground plane counterpoise elements bent downward to 70 degrees below the horizon.
COMPACtenna Installation 7 inch models on BSAKIT

COMPACtenna Installation 7in File Cabinet, Steel Table

7″ & 9″ models Available at:

COMPACtenna model 2M/220/440 at Universal Radio
COMPACtenna model 2M/220/440 at Ham Radio Outlet
        COMPACtenna model 2M/440 at Universal Radio
        COMPACtenna model 2M/440 at Ham Radio Outlet
                COMPACtenna model SCAN-III at Universal Radio   Soon
                COMPACtenna model SCAN-III at Ham Radio Outlet   Soon

20″  &  58″  COMPACtennas
models 20M/2M/440, 10M/2M/440, 6M/2M/440, CB/2M/440, SW   &   40M/20M/10M/6M/2M/440 (aka 40Mthru440)
Most antennas require large ground planes with large ground/counterpoise lengths
all-around the antenna.
The 20″ & 58″ COMPACtennas require only a small ~ 3′ x 3′ metal sheet below it.

When antennas have inadequate ground plane/counterpoises, there is a problem…
RF ‘comes back down’ the OUTSIDE of the shield of the coax, causing problems
such as distorted signal (radiation) pattern, and potential problems with the (transmitting) radio.
In operation, one recognizes problems like these by seeing changes in signal reception and (V)SWR
while moving ones hand (wrapped around the coax) along the length of the coaxial cable.
Standard antenna technology typically requires large ground plane/counterpoises
and all-around/in all directions to avoid these ‘inadequate’ ground plane/counterpoise problems.
yet the COMPACtenna with only a small 3′ x 3′ metal sheet or perforated sheet/mesh/screen below it
exhibits no changes in signal nor (V)SWR while moving ones hand
along the length of the coaxial cable.

58″ Model

40M/20M/10M/6M/2M/440  aka 40Mthru440


20″ Models






These small antenna models work well with a small ground plane counterpoise
such as shown here using a 3/8″-24 thread magnet mount
on a small (only 3′ x 4′) commonly available galvanized steel flat (flashing) sheet* in a closet or attic,
or on a steel table:
*  Caution – Corners, edges

COMPACtenna 20M-2M-440 on floor in house  COMPACtenna 20in ATTIC PHOTO - CROPPED                 COMPACtenna Installation 20M-2M-440 on Steel Table

20″/58″ models Available at:

                                                                                                        6M/2M/440 at Universal Radio
                                                                                                        6M/2M/440 at Ham Radio Outlet
                         10M/2M/440 at Universal Radio
                         10M/2M/440 at Ham Radio Outlet
                                                                                                                     20M/2M/440 at Universal Radio
                                                                                                                     20M/2M/440 at Ham Radio Outlet
                                   ShortWave Radio at Universal Radio
                                   ShortWave Radio at Ham Radio Outlet
                                                                                                                                CB/2M/440 at Universal Radio
                                                                                                                                CB/2M/440 at Ham Radio Outlet
                                           40M/20M/10M/6M/2M/440 (aka 40Mthru440) at Universal Radio    Soon
                                           40M/20M/10M/6M/2M/440 (aka 40Mthru440) at Ham Radio Outlet   Soon

    I have a go-light ..goes wonky when I key up with the big dual band (antenna), but doesn’t with the COMPACtenna.
        COMPACtenna STEEL SOLDIERS Photo

    The COMPACtenna (is) working surprisingly well… I was skeptical about the antenna at first but so far so good…
    …and it doesn’t cause any issues in getting into my relatively low garage.
    I love the COMPACtennas, mine is mounted on a mag mount.
    I have a Compactenna that I can either mount to a crossrail, or I’d prefer to just mount it right into the track.
    Supposedly the way they are designed they also don’t need the same ground plane, which means you have
    more options to mount them. I thought it was BS but the performance so far has been excellent.
        COMPACtenna RAM TRUCKS Forum COMPACtenna Photo

GM TRUCKS   …with COMPACtenna
    I’ve started working on the radio setup for GMRS/Ham operations.
    Put in a Compactenna based on local feedback here from HRO in town and lots of the local offroaders.
    So far the reception and transmission is good…
    I’m just running a cheap HT to test reception with the new setup until I can figure out what I want to do
    for a real radio in the cab.
    I will say with the Compactenna I can hit GMRS repeaters 10 miles away pretty easily with a 5W HT. 
        COMPACtenna on GM Truck

TOYOTA 4X4’s   …with COMPACtenna
        compactenna on 4x4 photo

eHam Reviews of COMPACtenna

Amateur radio — also known as Ham radio — is the best overall way for preppers to keep in contact during an emergency.  THE PREPARED

    THE PREPARED: Emergency Preparedness – Survival Skills – HAM Radio