JJ Luna

Coffee House WiFi

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Seth's post was very informative and well laid out. The link below is a video on Metacafe by an engineer who teaches you how to MacGyver your antenna to extend its range with $0.05 worth of materials.

If you extend your antenna range, maybe you'll find other WiFi access points in the neighborhood. Then you can randomly choose different access points to muddy the waters. Creating your own, manual, pseudorandom frequency-hopping spread spectrum sequence may be a little more paranoid than what you are aiming for.

URL #1: http://www.metacafe.com/watch/837885/wifi_antenna_hack/
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