2/26 at 1230am WUTV & WNYO were testing ATSC 3.
I thought both were off the air until I saw the "Mode not supported" message on the black screen.

Don't you just need a TV with 4K capability? If I was a broadcaster I wouldn't be investing in ATSC 3.0 for just five years.

Well, too broke right now to get new tuners, need other hardware first, but the current crop of 4K TVs may get the streaming, but unless your manual says so, don't expect to be able to tune OTA.

Will have to go through the STB routine again.
When it does happen, my legacy tuners will be bricks then.

[Link: shop.silicondust.com]

Short answer; no, the resolution of the display doesn't address what receives the signal, the tuner. if it isn't a ATSC3 tuner it will only be in 720p or 1080i and that is a very compressed version of both except for (probably) live sports broadcasts.