Quote:
Originally Posted by fineshot1
Looks like a NMO 1/4 wave cap on a NMO mount and a 3/8 x 24 thread sticking up through the NMO cap hole.
Never seen anything like that - very weird.
If you take a large monkey wrench and screw off the black cap you will probably find the true
NMO mount underneath.
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That's a NMO mount. If you take it off and flip it over, you'll see the other end of the threaded bolt you see is holding a contact on to the inside of the plastic cap, and the contact touches the standard NMO mount on the vehicle. Like others have said, it's Antenna Specialist. I used to do installs for remote control cranes, the equipment came with that antenna mounted to a stainless steel plate.