This tiny Xbee 900 rf module is supposed to have a range of 15 miles. We all know that these specs are always best case scenarios that are not attainable in the real world but it probably means that we could get 9 or 10 miles out of it. I can just imagine the projects that could be possible with this type of range!
"The XBee-PRO XSC OEM RF module is a 900 MHz wireless solution designed for maximum range within the XBee® footprint. Capable of point-to-point, peer-to-peer and point-to-multipoint networking, the XBee-PRO XSC is ideal for solutions where RF penetration and absolute transmission distance are paramount to the application."