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 the plate with two 1/4 inch delrin pins to prevent rotation but to break away when you hit that tree limb or garage.
When installing, vertical, left to right is determined by placement of the holes. The surface needs to be near vertical since there is no adjustment in and out toward the vehicle.
This is a fixed ball, is does not swivel.
A new SO-239 antenna ball mount made from solid aluminum bar stock.
Good for any size antenna with a PL-259 base.