If you want an OTA DVR, you're better off looking at an HD HomeRun tuner (either ATSC 1.0 or 3.0) paired with a computer running either Channels DVR or Plex DVR. Either way, you'd watch live and recorded TV via the Channels or Plex app on Apple TV, Android TV and/or Fire TV. (The Plex app supports additional platforms too, like Roku and various smart TVs.)tiVo literally doesn’t have a model that works for me right now, which is kind of scary. I don’t have cable, and I’m certainly not buying a DVR with only two tuners and a tiny hard drive. I can’t believe they canceled their four tuner
If that's all too complicated, have a look at Tablo.
But at this point, I really wouldn't recommend a TiVo OTA DVR except maybe to someone who's very tech-challenged (like an elderly person) and needs something that's as much like a cable box as possible. Even better if they don't use any streaming apps, in which case the TiVo could be their only box (because if you use streaming apps, you're probably going to want to access them on a different device than a TiVo, which is a very sub-par streamer).