Here's details on how I mounted my two lighted whips:
I made the mount plates on the PlasmaCam and the light whip mount is located right over the center of the rear-most hole in the bed top rail:
http://i499.photobucket.com/albums/...Lighted Whips/20160812_163609_zpszwq2rj1t.jpg
I placed the plate where I wanted it located, then drilled the four 1/4" holes for mounting. Tried using Rivit Nuts through the bed top rail, but they pull through too easily. So used two SS washers between mounting plate and bed top rail just to help keep things clean.
Cut a rectangle in the mounting plate and then used a dremel diamond bit do cut a matching hole in the top bed rail. I have two older style whips that use a flat connector. So the rectangular opening was necessary.
I put all the wiring for both whips behind the General side plate on the driver's side.
To run the extension cable across the bed to the Passenger side whip, I simply covered the flat cable with black Gorilla tape:
The Passenger side cable then runs inside the fender well and up to the whip through the mounting plate:
As I posted in my license plate bracket post...I spliced into the taillight wires in the OEM rear harness. Red and Green wires. I then ran those to a four pin connector, that you can get at NAPA and who knows where else, and doubled them to have two sets of red and green wires. One set runs to the license plate light. The other runs to the LED controller for the whips.
Thus anytime the key is ON, the whips are on. OK by me. And if I really want them off, just unplug them at the whip.
If you're interested in my mounting plates...PM me.
Pirate