What they forget to tell you is that the wifi source has to be LINE OF SITE! If your source is an indoor router that is 10 miles away, you will never see it at all even on flat terrain. Yes Wifi can work at long distances BUT the source and the receiver have to have outdoor high gain directional antennas (aimed at each other) and the radio path has to be line of site - no obstructions!
The record for wifi distance at present is 237miles.
Check this.http://www.engadget.com/2007/06/19/venezuelans-set-new-wifi-distance-record-237-miles/
But a Yagi on your router isn't going to work that way unless there is another yagi pointed back at you from the other end and nothing is blocking them! In areas where there are lots of wifi routers you won't get very far at all because of all the interference.
The other thing they forget to tell you is your Linksys home router is about 30-50mw of output and the ones used for long distance are 250 or 500mw out! These specialized routers are designed for outdoor use as well.
Linear Mode
