The Comet GP-21 is a base station vertical antenna designed for UHF operation. It is constructed for fixed installations and supports high power handling on the 430–450 MHz amateur device band. Frequency Coverage: 430–450 MHz Power Handling: Up to 200 watts (maximum input) Gain: 8.0 dBi Impedance: 50 Ohms VSWR: Less than 1.5:1 Antenna Type: 5/8 wave × 3 stacked vertical design Connector Type: SO-239 (UHF Female) Length: Approximately 10.8 feet (3.3 meters) Construction: Fiberglass and aluminum elements Mounting: Mast-mount capable with included hardware Application: Base station UHF antenna for fixed amateur radio communication This antenna is designed to provide fixed UHF coverage for amateur device systems in the 70 cm band.