The 02623 is 4.5dB gain, roof mount Fibreglass Antenna covering the 470-490 section of the UHF commercial Mobile Radio Bands. The 02623 antenna offers a genuine 4.5dB* of gain on the horizon across the whole designated band of operation when installed on a Ground Plane (as a radiator on the 02635 it is part of a 6.5dB* system). It is designed for optimum performance on the 02740 mobile base and covers the entire respective designated bands of operation under 1.5:1 VSWR.