Interesting finding the other day. I had my rear defroster turned on in my S60 and my XM radio had a lot of static on it which it never has. I turned off the defroster and the static went away. Tried the defroster again and static returned...defroster off, static on. Weird. The antenna is mounted in the front center about the windshield, NOT near the back. It must have something to do with the FM antenna which is built into the rear window. Anybody else experience this? Any way to fix that?