I think you need a plex pass but am unsure, as I already paid the 'lifetime' sub before I added a tuner. I think so since the guides aren't free (for plex) but it's been a few years since I researched it all.
Ye, this is one thing I did for the folks, so there is always new stuff even when I'm not managing it. They have like 20 shows they are slowly recording.
I got the HDHomeRun Extend, 2 tuners in one unit. Slap an antenna on the wall and boom, extra functionality.
There is a lot to love about living in WV (politics aside) but antenna TV reception is not one of them, sadly. Even moreso since broadcasting went all-digital. Signals don't travel well around the mountains. I'd go back to an antenna in a heartbeat if I could get decent reception. I'm only about 15 miles away from a couple of the towers and can't even pick them up without a really huge roof antenna.
My plex server is the best streaming experience I ever had. Only stopped running it because I just wasn’t watching anything for a good bit. More time on my hands now, so time for a revival.