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directional antennas
Submitted by Mark on April 23, 2006 - 8:34pm.

"They might not necessarily just sit across the street - most likely they'll build a better antenna to go somewhere further away from the house where they can't be seen."

In fact, they have directional antennas that you can use to pick up WiFi signals from a mile away or more. So if someone really wanted to, they could passively listen in on your wireless, decrypt it, and see all of your traffic...from quite a far distance away.

http://www.hyperlinktech.com/web/antennas_2400_out_directional.php

http://www.radiolabs.com/Articles/wifi-antenna.html

http://www.oreillynet.com/cs/weblog/view/wlg/448

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