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Using an idea posted by Gasgzlr, I used two Tram-Browning 1/2 inch stainless "L" brackets to install a President Iowa antenna to the new pickup. It does require drilling two holes to attach the two brackets together. I used stainless hardware to connect the brackets.
The radio I installed is one of the President Bill FCC units. I used a 9 foot Firestik Fire-Flex coax and went through the large firewall factory grommet on the driver's side using a small socket extension. Taped up where I went through the grommet afterward with new friction tape. It's wired to the outfitter 1 switch using the factory pass-through wires. I used indoor outdoor Velcro to attach to the dash. The SWR across the board is 1:3.
It comes with a barrier where the metal surfaces meet. Plastic of some sort it looks.
You're defeating the purpose then if it's any type of isolator. By doing this you are shunting your ability to achieve a better ground plane by not having the two metals contact each other. Sure you get some through your coax - radio - ground, but the antenna mount itself should be contacting a metallic surface to make better gains. the ground in the coax touches your metallic connections which in turn touch the mount and by touching the body or frame with your mount your adding to your planes ability to be useful. Aluminum and S.S. have a lot less problems than aluminum and carbon steel. Aluminum by itself in a caustic (salt / sodium chloride) environment will oxidize.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.