When I use the WiFi service in many of the RV parks I frequent, (usually the one that's called "I have internet" in Spanish) I can generally get a good signal and good bandwidth with my WiFi antenna but they throttle me at 500 megs of data per day so that the idea of streaming in HD becomes a waste of time, . . . . until tomorrow. Then it starts all over again. I'm not saying it doesn't exist, but I've yet to find an RV park or campground with WiFi that lets me stream in HD (for free or included in the regular CG rate) for any length of time.
If you want to try it anyway, ask your favorite electronics store for a "super high gain WiFi directional antenna." It's kind of like a point and shoot WiFi antenna rather than an omnidirectional scatter.
Chum lee