My Dad had an 82 Cutlass Supreme that had the antenna is the windshield as well. I drove it for a few years - loved that car, still have it waiting for me to fix up once I have the time to do so - anyhow, the reception was usually fine unless you had the windshield wipers on. Seems that the movement of the blades disrupted the signal, so every pass of the blade, a loud burst of static would occur...not the best feature if you live where it rains a lot (Victoria BC).