I have one of the hand held units, but I think you will get much better/clearer reception with a real CB.

I wonder if there are any units small enough to mount up top in the headliner?

Better yet, are there DIN mountable CBs out there? I have been thinking of pulling out my power inverter and mounting a stronger one somewhere else.

Edit: Ahhhh, here we go: COBRA 19 DX III
Bart