Audiovox XMARINE Marine Mount Antenna Designed specifically for marine applications Durable, weather-resistant design withstands extreme environmental conditions Mounts easily on virtually all boats using a standard 1 x 14 Inches marine threading Feature dual mode for continuous reception Flush mount. Fits standard 1" - 14 thread marine mount brackets or mast (optional). Suited for high-vibration, salt water environment. For use with single input receivers.