I'm just about done installing a Cobra 75 WX ST in my LJ. It's been done thousands of times, of course.
For the antenna mount I'm using a Teraflex tail light mount (driver's side). I'll take a picture when it's all done. Here is a picture of a hole cut to route the RG8x coax cable.
I actually sculpted the hole with a rat-tail file rather than drilling it. I painted it with a primer and silver metallic top coat. I was too impatient to put on a clear coat.
I'm attaching the remote box under the steering column. I worked that out on my own. Made a simple mount using brass that I have lying around. Otherwise would have chosen a wider piece of aluminum. Mount attaches to existing 3/8" hole. CB box attaches to mount with four 8-32 screws and 1/4" aluminum stand-offs.
The installation picture is focused wrong, but you get the idea. I need to dust behind the dash plus deal with some mild rust. I think the PO must have hosed out the cab a time or two, causing some mild rust. Note to self: never hose out cab!