I am really new to Jeep so I can't tell you the best way.
I think I would go out through a firewall gromett and run the RG-8X coax along the passenager side of the frame and then up the tire carrier and then to the mount using PL259's on both end of the coax. I would get a mount that uses a SO239 type of mount, (SO239 Connector is the other side that a PL259 attaches to. PL259 is a standard CB type coaxial cable connector).
At least that is what I plan on, time will tell.
Do it right the first time !