1997 Buick LeSabre Owner's Manual - Page 168

Heated Backlite Antenna Your AM-FM antenna is integrated with your rear window defogger, into your rear window. Be sure that the inside surface of the rear window is not scratched and that the lines on the glass are not damaged. If the inside surface is damaged, it could interfere with radio reception. Do not try to clear frost or other material from the inside of the rear window with an ice scraper, credit card or other hard object. This may damage the rear defogger grid and affect your radio's ability to pick up stations clearly. If, when you turn on your rear window defogger, you hear static on your radio station, it means a defogger grid line has been damaged and must be repaired. (Your radio is not at fault.) If you choose to add a cellular telephone to your Buick, and the antenna needs to be attached to the glass, be sure that you do not damage the grid lines for the AM-FM antenna. 3-36