1997 Cadillac Catera Owner's Manual - Page 163

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. If, when you turn on your window defogger, you rear hear static on your radio station, it means a defogger grid line has beendamaged and must be repaired. (Your radio is not at fault.) Do not try to clearfrost orother material from the inside of the rear window with anice scraper, credit card or other hard object. This may damage the rear defogger grid and affect your radio's abilityto pick up stations clearly. If you choose to adda cellular telephone to your Catera, and the antenna needs to be attached to theglass, be sure that you do notdamage the grid lines for the AM-FM antenna. 3-24