6dB gain. Collinear phased 5/8 wave elements w/ special filtering to suppress Out-of-Band Interference. 30 watts of power input, VHF marine band frequency, brass and copper elements to maximize range and efficiency, stainless steel ferrule w/ standard 1"-14 thread. Includes 20' RG-8/X cable and a PL-259 connector. Suggested mount: Shakespeare style 4187