for Netflix, you need to subscribe to the highest tier in order to get UHD programming
To add: in Netflix you can search "UHD" and it will pull up everything in UHD. Same for searching "HDR".
Linear channel UHD TV broadcasts have so far been very rare in the US (we are falling behind Europe). Pretty much limited to DirecTV I believe. NBC/Comcast is promising some Winter Olympics coverage in February I believe though.
I do have DTV but not worth the hassle of getting new eq. for just maybe 1 channel. 
Probably not. They already compress HD to get more channels to you, adding 4k will just take up even more space for them.
What about when you search for "4k"? I get a bunch that will show up that way.
I think I'm now understanding the issue I've had finding stuff:
I was one of the first Primestar™ satellite customers back in the mid-90's, and they were only putting one or two channels on a transponder back then. You can't believe how good it looked! Aside from the 4x3 aspect ratio, it looked as good as nominal HD content delivered from cable/sat/streaming looks today.
Yeah, OTA in particular has no real interest in making HD look good. Someone bought someone out here (we have about 4 syndicates that own practically every station now in the country now), sold off the channel broadcasting FOX and moved it to a subchannel with CBS. So now they both look like dogpoop. I've watched less football this year because of it, and absolutely refuse to watch any other programming on them. I'm sure we'll see a few linear channels pop up here and there mainly on DBS. But I wouldn't hold my breath. Money talks with these guys, they don't care about their PQ or even the quality of their programming.I was one of the first Primestar™ satellite customers back in the mid-90's, and they were only putting one or two channels on a transponder back then. You can't believe how good it looked! Aside from the 4x3 aspect ratio, it looked as good as nominal HD content delivered from cable/sat/streaming looks today.
So the way I look at broadcast 4K, which they will inevitably compress and "rate-shape" the heck out of, is this: Maybe then we'll finally get the HDTV we were originally promised!
HDR and 4K are two separate things. You can have 720P HDR.
Not only that but you have to author for HDR using color grading. So it's a bit like 5.1 sound which needs to be authored too. 4K is just a resolution standard and much content is acquired nowadays in 4K or better.
I'm sorry, but I'm unfamiliar with that term. What do you mean by "authored"?
