Make sure you don't take power off of any accessories. I take mine straight from the battery (with a fuse of course). And route the antenna signal cable as far from any power wires as possible. I had some noise issues back when I installed amps for the radio and I cured most of the isses by making sure the dash was firmly grounded.
My CB
My antenna:
I've lost 2 fiberglass ones so far. One that was mounted on the side of the bed (lost to a tree), and then I mounted one in the middle of the bed, directly behind the cab where I thought it'd be safe (lost to a different tree). But Now I have a cheapie whip antenna mounted on a spring. Takes a beating but it's still there. :D Plus, now I can do this:
By the way, incase you're wondering why a thin metal whip looks oddly thick, I sleeved it with vacuum line. :D It's just for looks though, I take it off on the trails. Otherwise the rubber line grabs the trees, while the steel will just deflect.