GIANT DISCLAIMER: I know (virtually) nothing about wireless networks. I just bought an Airport basestation and card on eBay and am breathlessly awaiting their arrival via UPS.
Still... how cool is this?! Apparently you can make a pretty darn good directional antenna for the price of a can of stew (or tomatoes, for the non-meat-eaters among us) and a handful of nuts and bolts.
Of course technology can always be used for good or evil. BBCi has an article about folks trolling the streets of London for unsecured 802.11b wireless networks. On the upside, others are using the same technology to share cheap internet access.
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