The range for 802.11 is around 100 to 300 feet, depending on obstructions in the LineOfSight. People report using Primestar dishes to obtain ranges of up to 10 miles.
WifiNets and WifiBoxes are designed to make it easy to be NearBy.
You can extend the range of an existing WifiNet just by putting a WifiBox the periphery of an existing WifiBox (see OhReally )
- You may not even need to provide a connection to the internet!
-- JonSchull