I installed a Cobra 29 LX in my 2 door 2015 yesterday using the rugged ridge cb mount and rugged ridge spare tire carrier antenna mount. I had a problem with SWR at first, but it ended up being an adapter on the back of my CB. I bought a RG-8X 15 feet cable with a PL259 connector (typical CB)
and a male BNC connector
. The BNC end is for quick disconnecting the CB. At the CB I had a BNC male to female 90* adapter. On the CB I had a PL259 to female BNC. It ended up that the cheap BNC right angle adapter was making horrible contact. After removing the right angle I got similar SWR to what you are measuring on the channels using an SWR meter.
By the way, my Cobra 29 LX has a built in SWR cal and meter. It agreed pretty well with the external inline SWR meter.
For those new to the lingo:
PL-259 = male plug
SO-239 = female socket
BNC connectors are a coaxial quick connector:
I used a wire wheel to remove the powder coat on my antenna mount bracket at one of the mounting holes and where the ground/shield end of the firestick antenna mount made contact. I ran a 12 awg wire from the bracket, through the tailgate to the rear seat belt anchor bolt. I used large ring lugs and made sure the seat belt anchor nut had all of the black oxide cleaned off the bottom where it would make contact with the ring lug.
I ran my coax along through the taigate and along the roll cage inside the zippered covers to the windshield frame.I hid it under the plastic and routed it out at the footman's loop where the hard top latches.
I removed most of the dash panels to route the red 12V+ wire from my CB to the keyed 12V power outlet/cigarette lighter in the dash. I grounded the CB to one of the two torx screws holding the footman's loop and rugged ridge CB mount to the windshield frame.
I ended up using the spare tire carrier mount and a 3' (Actually 38") firestik so that I could pull my 2 door into a 7' tall garage door without contact other than the weather strip. It fits well.