Is AppleTV 3rd generation still supported in Channels and will I issues if just use it as a client on a 2nd TV?
The 3rd generation Apple TV does not run tvOS or have an app store. Channels can not run on it.
Only the Apple TV HD from 2015 and newer are supported.
Got it! Thank you for the quick response.
Also note that only the 4K AppleTV models can reliably stream ATSC 3.0 channels, the AppleTV HD cannot:
Ah! Thanks for the heads up. That explains why I am having issues with my HDHomerun on GoogleTV. Good to know.