Style 396-1 VHF 3dB Center-fed 1/2-wave coaxial sleeve: Outstanding, basic 3dB antenna designed to reduce signal fading in rough seas. This is probably the most widely used antenna on Coast Guard vessels. Brass and copper elements, Chrome-plated brass ferrule with standard 1&qout;-14 thread, Includes 15' RG-58 cable and a PL-259 connector, Suggested mount: Style 4187 Ratchet Mount, One section. Omni-directional, vertical plarization. Max input of 50 watts. 50Ohm impedance, SWR of 1.5:1 at 156. MHz, 5MHz Bandwith within 2.0:1 SWR. Frequency is VHF Marine Band.