If there are local digital broadcast signals that can be picked up where you happen to be, it's possible to watch tv on your computer without a satellite dish, cable or wifi. You would need a digital tv receiver/tuner to put in line between an antenna and the computer.
They are a real thing. Just Google "digital tv tuner for computer" and sift through the results for something that fits your particular 'puter. Or just look on Amazon - these days, they seem to sell everything.
Of course, if you're addicted to dish/cable tv shows, this solution won't work. But if you just want to watch some news, weather, network programming, PBS, some sports or one of the new digital channels that show movies and original programming, you can use your computer's nice big monitor. No dedicated tv set needed.