The only sport I watch regularly is the NFL. Picked up an HDHomeRun for under $100, which connects to your router and a TV antenna. Now I can watch OTA channels on devices connected to my WiFi network. It'll stream to phones, game consoles, or android TV boxes.
If you've got a Chromecast attached to the TV then you can stream from a Chrome browser window to the TV which can be more convenient than hooking up a computer directly if you're resorting to /r/nflstreams or whatever.