3' (0.9) VHF Marine Band 3dB Gain. While we manufacture our antennas to perform at the highest level, we also design with boaters in mind. With a convenient press-and-twist bayonet fitting, attaching or removing the stainless steel whip from this VHF antenna is quick and easy. Stainless steel whip (36")Whip is user replaceable.SO-239 connectorL shaped bracket included for mounting to a vertical surfaceCoax and PL-259 connector sold separately