This one was counter-intuitive, but it worked. I’ve been suffering through static and interference ever since my Monster iPod FM adapter burned out and I replaced it with a different model. My Passat has the rear-roof-mounted antenna, and it’s apparently too far away from the FM adapter that I use for my iPod. It’s great at pulling in distant radio stations, which tend to swamp the empty channels that I’d normally listen to the iPod on.
So I removed it.
Yep, just unscrewed the antenna and now the reception for the iPod is crystal clear. Smart but totally counter-intuitive.
Credit goes to this anonymous poster on MacOSXHints. I read this a while ago and just today had the nerve to try it. No more static for me!