If you want to watch live TV on your Apple TV with an HDHomeRun, you can go the free route by using Kodi, but Channels is by far the best live TV watching experience to be had on Apple TV. Not only does Fancy Bits' Channels app allow you to watch live TV, but you can also pause and rewind local or cable TV directly from your Apple TV when paired together with an HDHomeRun.
If you're unsure what an HDHomeRun is, or how it can help you, then be sure to check out our post on the device. In a nutshell, the HDHomeRun allows you to stream free (or paid) television over your home network. The Channels app can then acquire the stream made available by the HDHomeRun, and display it on your television.
At $14.99 for a limited time (normally $24.99), Channels isn't cheap, but it's a great-looking and overall solid experience for cord cutters. Have a look at our full video walkthrough for more details.