I gave up on camp ground WIFI as well... Even the cable TV suffers at time as well when they fill up with people...
I usually switch over to OTA antenna and pick up the local TV stations doing that. Always pick up something...
I went with VERIZON MIFI Box for times like this... It does need a lot of GB's however... You can do this using your later version smart phone but mine is one of the older one that doesn't do the make you own HOTSPOT thing...
Between my BATWING OTA antenna and my VERIZON MIFI box we can watch TV pretty good just about everywhere... Even when are camping OFF-GRID somewhere...
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If I get real desperate I bring along my eight BOW TIE antenna...
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Roy Ken