Do you have a device to improve wifi reception of signals in a campground?

You probably want to purchase a router or access point that will bridge to the existing signal in order to repeat it. Search Google for information on how to repeat a wireless signal.

And yes Best Buy does sell those type of devices..i would definitely browse through google, do your research before you buy!!!

A new, more powerful WiFi radio. Replace the old one. Repeaters don't work as advertised. I use Netgear R8500 and it's what I spec for my customers. Expensive, but worth every penny. Don't forget, Best Buy will price match any competitor.