There are definitely wi-fi AND cell phone signal boosters. I am researching the same thing for next seasons camping.
We use my Verizon's phone mobile broadband option to provide our wifi in parks that do not have it but for parks that do have it, like the one we are in now, I would love to have a booster. Mainly because right now I am at a 2 out of 5 signal strength. I know there are MANY VERY EXPERIENCED MOC Members who do this on a daily basis and can give you really good information but since the search function is not working right now I can't find their previous posts. I did find this article to get you started...until a MOC member has a chance to educate us. Hope it helps!
http://www.gonewiththewynns.com/mobile-internet
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