I've been watching this show on Antenna TV lately, and am wondering why they cut the theme song out.

Antenna TV didn't cut the theme song out. Wings quit using their theme song beginning in season 3 I believe except for special occasions like the last episode.

I did not know that about the show. See, Season 6 is playing at the moment and got confused at the beginning as in why the song wasn't playing at first.

But thank you for clearing it up with me.