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?