In Syracuse (about 50 miles away from me) the three network broadcasters collaborate to run one ATSC 3 transmitter with big which I can tune in with
https://www.silicondust.com/product/hdhomerun-flex-4k/
The picture on ATSC 3 is high-quality 1080i/720p with an aggressive surround soundtrack which sounds great for sports events on my home theater upstairs. I wind up watching the ATSC 1 channels more because: ATSC 1 signals have subchannels like Comet (I am a sucker for Quantum Leap, Baby Godzilla, Time Bandits, ...), the new audio codec in ATSC 3 doesn't work on every device, and the ATSC 3 signal is a little less robust than most of the ATSC 1 signals.
I think Sinclair broadcasting (the owner of the transmitter) is more interested in embedding sports betting into sports events as an interactive application than they are in 4K. I think that will wait until they start turning off ATSC 1 transmitters and turning on more ATSC 3 transmitters, but that will take a long time.