Models 2M/220/440 and 2M/440
VHF/UHF COMPACtenna models benefit from some downward-projecting
ground plane counterpoise metal.
For mobile installations the COMPACtenna works best
at/near the corners of the vehicle roof or trunk.
Here are photos of the 7.5″ models on NMO magnet mounts:
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.
These 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 sheet
or on a steel patio table:
[Model 27-450 below is discontinued]