6018-R Phase III VHF Antenna - 17a ^2 6a ^2 (5.3M) VHF Marine Band 9dB Gain Good communication over the VHF Marine Band depends on antenna height, quality and dB Gain. This high performing Phase III(TM) marine antenna is a powerhouse providing all of those necessities in our rugged, high-strength, foam-filled fiberglass radome for stability in high seas, high winds and high speeds.Features:Silver-plated outer conductor, copper inner conductora Stainless steel mounting sleevea Type SO-239 connector inside mounting sleeve for easy mounting and dismounting for stowagea Suggested mount: ShakespeareA(R) Style 409-R or 410-R Mounting Kita Two sections: Base 110a ^2, Tip 110a ^2Specifications:Design: Collinear-phased 1/2-wave elements with choking sleeve Height: 18' (5.48m)Weight: 20lbs (9kg)Gain: 8dBConnector Type: SO-239Suggested Mounting: 409-R or 410-RImpedance: 50 ohmsMax Input Power: 150WDC Grounding: NoShakespeare Limited Warranty: 8 years