There are antennas[1] that let you sniff wifi from ~4 miles way. Some routers can be configured to drop clients more than N meters away, though. [1] http://ww

There are antennas[1] that let you sniff wifi from ~4 miles way. Some routers can be configured to drop clients more than N meters away, though. [1] http://www.radiolabs.com/products/antennas/2.4gig/long-range-wifi-kit.php http://www.radiolabs.com/products/antennas/2.4gig/long-range...