You have a few options:
- If where you are dry camping has a cell signal you can turn a hotspot on your phone or tablet and use that as the wifi between the TV and the device with the movie (you won't use any data as you're just sending the data between the TV and the device playing the downloaded movie). You may even be able to do this without cell signal--would have to see what the cellphone does with hotspot enabled and no cell signal
- Pick up an inexpensive wireless router and use that as your wifi between the TV and the device in question
- Pick up an inexpensive HTPC and use that to play videos (typically these will also have WiFi and you can set it up as a host for the WiFi network, or you could use it with the router above)
- There are a few on the forum here that have setup a whole system with a PC, router, an antenna to pickup the campground's WiFI and then have their own "RV WiFi"--the possibilities are endless if you have enough $$ to spend
All you really need is a local WiFi network to connect your devices to the Apple TV either a hotspot or small router should do the trick (you can even plug the Apple TV into the router via a network cable too).
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