Sirio Antenna GP3E 140-175 MHz 5/8 VHF Ground Plane Base Station Antenna, 3.65 dBi Base station antenna, omnidirectional, low-gain, mono-band, suitable for land and marine service-tunable by whip length adjust Type: 5/8 Ground plane frequency range: Tunable 135-175 MHz polarization: Linear vertical Gain: 1.5 DBD - 3.65 dBi bandwidth SWR 2, maximum power (CW) 30C: 200 watts Grounding protection: All metal part are DC-grounded, the inner conductor shows a DC-short connector: UHF-female, gold plated central pin Materials: Aluminum, brass, nylon wind load/resistance: 46 Nat 150 km/h - 120 km/h