Shakespeare 4' Phase III AIS Antenna - 3dBThe Shakespeare Phase III AIS Antenna enables reliable communication over marine AIS frequencies. This antenna has been specially engineered and tuned to match AIS transceivers and is backed by Shakespeare's 8 year warranty. Ethafoam spacers, thick radome, and silver-plated elements enhance the antenna's technical performance and longevity. Designed to look good on any vessel, the Phase III Antenna has a durable, high-gloss, white polyurethane finish to prevent yellowing.Features: Silver-plated elements provide maximum range, clarity, and efficiency; Stainless steel mounting sleeve provides greater durability and rust prevention; SO-239 quick connect allows for removal or installation of the antenna without twisting or reinstalling the coax cable; 12-sided facet indexes and prevents the antenna from rotating during installation; Ethafoam spacer system isolates the radiators from vibration for long, dependable service; 8-year warranty; Specifications: Height: 4'; Sections: 1; DB: 3dB; Connection: SO 239, Mounting sleeve included; Suggested Mount: 4187-HD; Max Input Power: 50 Watts; Bandwidth: 5 MHz within 2.0:1 VSWR; DC Ground: Yes - Read shortened; Supersedes: 6396-AIS