Covers 40-47 MHz low band frequency range with unity gain Requires NMO Mount Metal ground plane required 3/4' Permanent Hole (NMO) Brass Mounts 3/8' Permanent Hole (NMO) Brass Mounts 3/4',3/8', 5/8' Alternative (NMO) Mounts 3/4' Magnetic Mounts (80lb pull strength) 3/4' Mini-Magnetic Mounts (50lb pull strength) Mobile Mount Kits & Brackets (Mirror mount & L-Brackets) Mini-Trunk Lid Bracket w/ Mount