Just to learn what happens on a drive. First went to XM, thought that would be dead, but that guy came through loud and clear telling me what I am missing with that toll free number showing up clearly on the radio screen.
Then I tried our four remaining AM stations, all came through loud and clear. FM picked up stations clear 50 miles aways, one that I know is 70 miles away was breaking up a little, but still audible.
Then I tried calling my wife via bluetooth, guess that disables the transmitter in my phone, couldn't get through, works fine with bluetooth disabled, but not with that antenna off.
Didn't try calling OnStar, ha, if I did, would be in for a long sales pitch, but that green ready LED was on, so assume that also works.
So what is the purpose of that whip antenna? My only conclusion was for hands off calling. MP3's still worked great.