AV7M Marine VHF Antenna - 4'AV7M is a high quality dipole antenna designed for the marine VHF radio telephone service. It is a high quality antenna with a durable construction and a beautiful finish for installation on all kinds of vessels.Specifications:Design: Center-fed coaxial dipoleRadiating elements completely enclosed in polyurethane foam within a fibreglass tubeMounting bracket: AluminiumHeight: 1.25m, 4ftWeight: 1 kg, including U-boltsWind rating: 55 m/s = 125 mphFinish: Polyurethane lacquer, whiteTemperature range: -55°C, +71°C; -67°F, +160°FFrequency range: 156-162 MHz, VSWR Nominal impedance: 50 ohmPower rating: 100WGain: 2dbiPattern: Horizontal plane: OmnidirectionalPolarization: VerticalConnector: UHF female is standardDC-grounded: YesMounting:AV7 can be mounted directly onto the bulkhead by means of 4 holes in the aluminium bracket. It can also be attached to a mast or tube using the supplied M6 stainless steel U-bolts. The mounting tube can be horizontal or vertical.Suitable Cable:RG8, RG213 or similar