I had a few back in the day. Had a huge 22ft GP on the roof of my mums house, which itself was on a 10ft scaffold. Used to 'bleed'(interfere with other CB'ers)around the estate where I lived.
As a mobile comms, they're bloody useful things to have when mounted to a vehicle. Combined with a 'burner'(amplifier) you can get a very reasonable range on a standard, FM, 27mhz set up.
Start playing with AM, USB, LSB, SSB Etc, and your range increases quite drastically in some cases. They also do 'handheld' cb's.....although range was really quite limited.
As anyone considered obtaining old military radios??? Clansman radios etc?