My '04 CTS did the same thing but only on the AM band. As long as you were tuned to a strong station it was okay but if you were tuned to a weak one everytime you hit a bump in the road it sounded like you were sleeping on an old army cot at the no tell motel.
rear window defrost.. affecting radio signal
Pretty much the title exsplains it. Turn on my defroster cuz i forgot to scrape the rear windsheild this morning. So yea my radio reception goes to shit. And doesnt play anything but static fuzzz.. turn the defrost off and radio comes back. 
Cadillac gets a fail on that Note.
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So my question which i forgot to ask. How do i ge ride of this problem?
Cadillac gets a fail on that Note.----------
So my question which i forgot to ask. How do i ge ride of this problem?
