Years ago, I saw a black ABS plastic angled NMO Mount on the rear quarter panel of a Crown Vic. It allowed the base of the antenna to be "Level". You could twist the two part base to adjust to any angle. I am pretty sure the bottom side of it was a SO239 connector with a nut to tighten it up on the inside of the vehicle. I have searched a good bit online to no avail. Does anyone know where to point me to find one? Thanks in advance for any input.