If you remove the spoiler, there are holes in the roof already for the wiring for the brake light. I used that hole, and ran the wire down into the VX. Then you just need to pull (carefully) off the rear trim piece at the back of the headliner, just inside the back door. Your wire will come down in there, and then you can push it inbetween the headliner and the top of the trim, all the way forward to your A or B pillar. I think I ran mine down at the B pillar, and then under the plastic skuff plate on the driver's side, and then up through the firewall to my battery. In your case, you would just need a single coax cable to where ever your CB is going to be mounted.
Bart