Our motorhome has a metal shell all around it, which does a very good job of blocking WiFi signals. On top of that, campground WiFi is notoriously awful - weak signals from poor coverage.
A year or so after purchasing the RV, it was decided that one of the projects would be to add inside WiFi for mobile devices and the TV. That way they would all work when driving down the road by being connected to the internal network, but also pick up the campground WiFi for Internet access when parked. An added bonus of having our own permanent WiFi in the RV is that the kids' devices don't have to be set up with new WiFi at every stop.
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