I initially purchased Plex so I could watch media from my server while travelling but then I discovered it supported OTA with additional hardware so i purchased an HDHomeRun, hooked it up to an outside antenna, and I couldn't be happier with the experience. Not only do I get a guide that's like what you'd get with a satellite or cable service, I can record shows that air over antenna. I'm in Canada, close to upstate New York so I get about 42 or so stations all in, ranging from the primary networks like Fox, NBC, CW, etc., but also Canadian options like CTV and CBC. It's awesome being able to watch a Buffalo Bills football game on my tablet or phone while putting my feet up near the beach in Dubai.
And then I discovered some of the 'free' stations and movies that come with it and I have to say that I'm really impressed, I found myself watching some live performances of some techno music acts on their music station that I'd never expected to see. I also find myself watching the news stations as well.
I bought the lifetime Plex Pass on a Black Friday (US deals day) a few years back for $79 and that's a hell of a deal, well worth it for what they give you.