Live TV / DVR functionality is one of the biggest benefits of having a Plex Pass membership ($5 / mo, $75-150 / lifetime depending on if you get a sale price).
But from now until the end of June, this will be free to all Plex members, regardless of subscription status.
List of supported tuners here [plex.tv]
If you've been on the fence about getting Plex Pass, this is a great way to give it a trial run and see if you like it. I've been using the DVR functionality for a few years now to record Bills games in the fall, since I'm usually working on Sundays AND out of market, and this has been a great way to watch all of their games for free. The auto-remove commercial feature works pretty well too!