You should get one of these travel routers anyways, very energy efficient and uses a simple microUSB cable for power. I'm sure you've got USB power ports in your RV. You can also buy an external antenna and mount it on top of your RV for better wifi reception to the campground, Mcdonalds, Starbucks ...

I have an HDhomerun Extend, local off air tv is mpeg2. I'm using an Apple TV 4k with the "Channels" app to watch tv.

A few days ago I updated firmware from 20180327 to 20180817 and now get out of sync sound when it wasn't present with the older firmware.

If that is the case I may need to start purchasing apple tvs. Any kind of timeframe?

The Channel's APP on ATV already does this.

Applied as well. I SERIOUSLY HOPE that the will be tied to the iOS iPhone / iPad versions and NOT require an additional purchase like most other Apple TV apps. If you already bought on another device you also own the Apple TV version. PLEASE ,,, Applied. I second that - especially for the fact that...