I use a magnetic mount antenna on the centre of my 4runner and it works ok, though it has caught on branches and fallen off which can get very annoying .

I wish CB's were not used any more, they require huge antennas becuase of their wavelength. The quality is crap and the transmission range is also.

I prefer using my ham radio which can get excellent coverage and quality while only using a short 1 foot antenna on the roof - of course most people dont have a license though.

i guess i just dont like CB's. =)