PHASE III 6396-AIS-R 4&'; AIS Antenna 3dB GainSpecially engineered for the extra bandwidth required by AIS transceivers, this Phase IIIT antenna enables reliable communication over marine VHF frequencies. Silver-plated outer conductor, copper inner conductor Stainless steel mounting sleeve SO-239/PL-259 connector Specifications Max. Power Input: 50 watts SWR: Less than 1.5:1 at 162 MHz Bandwidth: 5 MHz within 2.0:1 VSWR Frequency: VHF AIS Marine Band DC Grounding: Yes Pattern: Omnidirectional Polarization: Vertical Specifications: Length (Inches): 48" Construction: Fiberglass Color: White Antenna Band: AIS Box Dimensions: 2"H x 2"W x 58"L WT: 2 lbs UPC: 719441200688