To watch Glenn Beck’s TV station GBTV on your TV you need a Roku box. Easy to hook up and it has all kinds of other stuff besides Glenn’s TV. I watch his program every day. Here’s a link to Roku which will explain everything about it.
I strongly suggest a visit to a ROKU forum not connected to ROKU for the horror stories.
After spending a few hours poking around for a clueless friend who wanted to get the service, I would stay away from ROKU until doing a thorough check.