Maxrad MFB 4503 450-460 Mhz Base Antenna, 3 db Gain. Maxrad MFB4503 is a 3 dBd gain fiberglass omni-directional antenna operating in the 450 – 460 MHz frequency range. This UHF omni antenna has a power input of 250 watts, is DC grounded and terminated with an N male connector at the end of a 16 inch jumper. Order mounting hardware separately.