It beat me. I learned that there are two clips that have to be pressed to get the antenna out, which would be fine. But I could not get the wire connector undone. They have some kind of trick connector that somehow hooks in, I could feel it have play pushing it in and out, but there are no tabs or anything to depress to undo it. Struggling with it got me close to messing up the headliner. So I put it all back together. My antenna is tight and the front touches the roof but the back has a quarter inch gap.
If I come across how that trick connector works I might try to remove the antenna another day.