The has been specially designed to meet the broader bandwidth requirements of all popular AIS transceivers. This commercial-grade broadband antenna comes complete with a mast-mounting sleeve and mounting U-bolts. Brass and copper elements sealed within the durable fiberglass radome enhance transmission quality. SO-239 connector at the base. Coax cable sold separately. Two-year limited warranty. Model#: 396-1-AIS. SPECIFICATIONS:* Height: 4'* Max. Input Power: 50 watts* Gain: 3 dB* Frequency: VHF/AIS Marine Band* Bandwidth: 6 MHz within 2.0: 1 VSWR* SWR: Nominally 1.5: 1 at 158 MHz* Polarization: Vertical* Impedance: 50 ohms* Radiation Pattern: Omni-directional* No DC Ground - Antenna will read "open-circuit" with ohmmeter test Brass/copper elements within fiberglass radome SO-239 connector at the base | Classic 4' AIS Antenna