Adaptor to support vertical whip antennas with 3/8" thread mounting

 The S217 is a heavy duty mount to accept 3/8" x 24 tpi male thread based antennas; the cable connection accepts a PL259 coax plug.

The adaptor has a stepped isolating washer to fit 13mm hole in a mounting bracket. Fixing nut will accept min 12mm thread from antenna.