This 500 watt 39" tall high performance CB antenna was designed for applications that do not have a ground plane (metal radiating surface). The antenna is fully weatherproof and has low wind resistance so it is perfect for all applications. Kit comes with "U" bolt mounting hardware that easily attaches to a pole and has a SO239 female connector on the bottom for easy coax installation. For optimum performance the antenna requires specific lengts of coax cable: 8' - 11", 17'-11", 27'-10", 40'-6", 59'-0", 78'-0". This product ships in approximately 1 days