in our old MH I used a RadioLabs Wave RV external antenna/wifi adapter mounted to our crank up batwing antenna. that really helped to capture a park's wifi signal as well as signals within a 3-5 mile radius.
very soon now we're taking delivery of a new class A without a winegard crank up so looking for a different solution. I recall reading about a way using a standard router that would capture the park's wifi signal and convert that to a secure wifi signal for use within the RV. can't recall which router or any other details. I'm looking into a MiFi/Wilson sleek, air card with cradle point and just using the tablet or phone's hotspot but I'd rather use the park's wifi signal as much as possible and any edge or way of maximizing that signal.