I read somewhere a while ago that some1 mentioned their HIDs caused interferance with the radio!
I noticed this the other night, parked in underground (so no signal anyway), but static was worse than normal, turned HIDs off and it calmed down a bit, back on and it went crazy static again.
I then noticed the next morning whilst listenin to Chris Moyles (only time i have radio on), that the signal seemed worse! never, in 3 and a half years, have i had to change/scan for radio 1 since i preset it! but i now find i need to do this from time to time!
How on earth can some wires and bulbs affect the radio? when i read the original comment i thought "nah, it aint possible, just good coincidence" but it does seem that HIDs interfere with your radio reception!