There's a similar post which I'll copy my answer here.
"In the past we had Richochet (modems) and in some places you can pick up WiFi such as a local bookstore for free.
In the future we have WiMax, but all this takes time unless you are lucky to have the Richochet up in your area.
Help! I'm new to wireless internet, and not tech saavy. Have a laptop. Need options to get wireless internet access while travelling, BUT at location w/ NO "hardline" connection like a modem, cable or satellite dish.
Specifically -- driving in a car on a road trip or staying on a houseboat on a lake.
I saw cell phone providers have cards, but you have to be close to their towers and moreso pay a LOT (like $175-$300) just for the card PLUS abt $80 a mo. service! I'm not likely to use it very often, so hoping for inexpens. options. Or maybe from a satellite co. rather than a cell co? Thanks to all!