I have the station wagon with antenna wires in the window glass on the rear side windows. I have never felt the FM reception was great, but since this summer it's been terrible except for the strongest stations. Recently when I followed a friend, he had good reception for a public radio station that I could not receive. The radio was replaced last winter because the power button would stick. I think it might be the antenna instead of the radio, but my volvo dealer says the only thing they can do is replace the radio again. If it's the antenna what can I do about it?