Good communication over the VHF Marine Band depends on antenna height, quality, and dB gain. The Shakespeare Phase III Marine Antenna is a powerhouse, providing all of those necessities in a rugged, high-strength, foam-filled fiberglass radome for stability in high seas, high winds, and at high speeds. A type SO-239 connector inside the mounting sleeve allows for easy mounting and dismounting for stowage. Eight-year limited warranty. Model#: 6018-R. KEY FEATURES:* Collinear-phased 1/2-wave elements with choking sleeve* High-gloss, high-performance, non-yellowing polyurethane finish* Silver-plated outer conductor; copper inner conductor* Versatile stainless steel mounting sleeve for standard 1"-14 thread mount or mast mount* Suggested mount: Shakespeare 409-R or 410-R Mounting Kit (sold separately)* Two sections: 110" base, 110" tipSPECIFICATIONS:* Height: 17'6"* Weight: 20 lbs.* Max. Input Power: 150 watts* Gain: 8 dB* Boat Length: =22'* Frequency: VHF Marine Band* Bandwidth: 3 MHz within 2.0: 1 VSWR* SWR: | Shakespeare Phase III 17'6" VHF Marine Antenna