I have my CB antenna mounted on the driver's side fender channel, between the hood and the fender. (I think Jage has it there, too.) Works well, although the antenna isn't up as high as it would be on the roof (unless you get a long antenna). I have a 3'-4' Firestik (can't remember exactly the length).
I have a similar driver's side fender channel mount for my 2m/70cm antenna. I used the "Universal NMO Ant Mt" (part UN-ANTPF) from Pro-Fit International.
Everyone has different mounts and setup but here is mine.
Oh year ground bolt is what is in front and don't forget to check your swr meter. The lift from ujoint on my rig had me cutting another couple of cm off to find that .8 tune.