SO-239 connection on top of the ball mount for the antenna and for the PL-259 connection on the inside of the vehicle.     The plates are 3 inches in diameter and 3/8 inch thick.  Stainless steel bolts with aluminum alloy 6061 construction.  A 1/8 inch thick solid neoprene rubber gasket.  The body is locked to … Continue reading SO-239 antenna ballmount for mobile Station