The GP-9 is the highest gain, dual-band fixed station antenna available from COMET. If you desire the absolute maximum coverage area, this is the antenna to choose. The radiation pattern is directed to the horizon omni-directionally around the antenna. However, keep in mind that a high-gain antenna pattern has narrow elevation angle. In mountainous areas the pattern will not reach valley floors or mountain tops. If you need to cover areas around the antenna that are a few thousand feet above or below the antenna elevation, the GP-6 may be a better choice due to the wider radiation angle of a lower gain antenna.
Comet GP-9 Operation Manual
Gain & Wave:
146MHz 8.5dB 5/8 wave x 3
446MHz 11.9dB 5/8 wave x 8
VSWR: 1.5:1 or less
Max Power: 200 watts SSB/100W FM
Weight: 5 lbs. 11 oz.
Mounting to Mast Size: 1 1/4 – 2 1/2"
Max wind survival: 92MPH
Construction: Heavy-duty fiberglass, 3 sections
Although hundreds are in use in repeater systems, it was not designed for mountain-top installation where extremely high winds, ice and other extreme conditions exist. It performs best in low to mid elevation installations where the high gain radiation pattern is most effective.