TT2..The average WIFI transmitter has a range of about 100 feet. Most campgrounds have antennas scattered around the CC for better reception//No cable hookup, no wires. Most PC's have a internal WIFI card or you can buy a external card as some have said.If you are buying a New Laptop it will most likely have the WIFI card (ask) just turn on the PC and wifi will be there if you are in range of a transmitter. Go to
www.howstuffworks.com search for WIFI and you can get a good explaination of how it works.