Specially engineered for the extra bandwidth required by AIS transceivers, the Shakespeare Phase II AIS Antenna enables reliable communications over marine VHF frequencies. The ethafoam spacer system and silver-plated elements enhance the antenna's technical performance and longevity. An SO-239 connector inside the mounting sleeve allows for easy mounting and dismounting for stowage. Eight-year limited warranty. Model#: 6396-AIS-R. KEY FEATURES:* Collinear-phased 5/8 wave elements* Silver-plated outer connector; copper inner conductor* Stainless steel mounting sleeve* PL-259 connector included* Suggested mount: Shakespeare 4187-HD Ratchet Mount (sold separately)SPECIFICATIONS:* Height: 4'* Weight: 5 lbs.* Max. Input Power: 50 watts* Gain: 3 dB* Frequency: VHF/AIS Marine Band* Bandwidth: 5 MHz within 2.0: 1 VSWR* SWR: | Phase III 4' AIS Antenna