[Mr. Douglas]

That was my thought too, except my nearest neighbor is over 200 yards away and over a hill.

[IYAS9YAS]

A normal WiFi signal can travel 1,000' unimpeded.

http://electronics.howstuffworks.com/gadgets/travel/wifi-detectors1.htm

World record, as of 2007, was 304 kilometers with special equipment.

http://newatlas.com/go/7878/