Thanks for all your help guys. Here is what I decided to do:
My CB is mounted on the center console on the passenger's side. I ran the cable under the passenger seat and under the side molding near the floor. Then I ran it under the rear seat and under the carpet in the cargo area to the rear. I then took the rear side molding where the spare tire holder is screwed into. I found a plastic cap near the light housing that I went thru. Maybe a little water will get in but I don't really care. I then cut a little hole in the plastic near the bumper.

I mounted the antenna with a flat bracket under the bumper cap and drilled a hole thru the bumper cap so the antenna wad somewhat protected. Here are some more pics.