I uploaded a couple of pics from #17084 showing the vent and the cut-
out for the antenna. Like I said it looks rough. I don't think the
antenna caused it - it seems to move freely up and down. A side by
side comparison of other cars showed a inconsistency in the way the
louver in the vent was carved out. My only guess is that these vents
were old stock from when the antenna was in the windshield or maybe
they are made like that?