I tried syncing it up with the WGR online stream last year and it didn’t work for shit. You spend a bunch of time getting the DVR in sync with the online stream, then they online stream hiccups and you’re out of sync again.
Honestly, if WGR had their broadcast on a decent sounding FM station, I’d slap together an FM DVR just to sync the radio with my TV. It’s just not worth it for crappy sounding AM.