Yeah man, there is no flag in the stream to tell your TV that it is anamorphic. You could make an anamorphic spot if you wanted but if the stations accepted the spot it would either run letterboxed 4×3 or, more likely, run stretched 4×3.
It’s interesting how many people in this industry around me don’t notice the local spots running in 4×3 or letterboxed. I have quizzed quite a few people I work with and they ALL claim to have seen local HD spots. I’ve started to carry around a $100 bill just to pull out and say “Wanna bet?”
I see all this stuff when I watch TV. I even noticed a national spot that ran right before the Superbowl in 4×3 SD which kinda blew my mind.