Features Specifications:Sell UHF Marine Antenna/Full Band  ELECTRICAL SPECIFICATIONS MECHANICAL SPECIFICATIONS Frequency Range 390-470 MHz Impedance 50Ohm VSWR less than 1.5  Gain 2.5 dBi Polarization Vertical Maximum Power Input-watts 100W Lighting Protection Direct Ground Dimension Dia. 24× 590 mm Diameter of Hardware-supplied Dia. 50mm Radiating Element Material Cu Radome Material Fiberglass Connector SO239