Range is going to depend on a number of factors. These include the environment/room that you are in (walls, corners, hallways, etc. )as well as the transmission power spec for the radio adapter (802.11b commonly 30mW)and the antenna being used.
The distance supported can also be extended by using a lower data rate.
I get a full 11Mb connection from my desk while talking through a wall to an Access Point 150 ft. away in a seperate labroom .