The Tram UHF Land Mobile Base Antenna has a heavy-duty fiberglass construction base, is 63 in. tall and has a frequency range of 406 to 512 MHz and a 6.5 dBd gain. Accepts mast diameters 1.81 in. x 2.44 in.. Includes three 7 in. stainless steel radials, UHF female (S0-239) connector and bracket.