The radio in my (ex-Vamps) 328i uses the back window heater as the aerial.
It's crap.
Or rather, sometimes it will pull in loads of stations, then suddenly you get one or two local stations and Classic FM. The last one is probably because it got burned in when it was Vamp's car ;-)
I gather it's a box on the C-pillar somewhere that acts as an FM aerial amplifier and has an 'on' signal fed to it from the radio. so...
Vamp, did you wire that signal on when you fitted the new radio?
For everyone: are they 'all like that, sir', or is it buggered?
Shall I just get an electric or bee-sting aerial for it instead? How about a natty little sharkfin with a built in amplifier, do they work any better?