Antenna on the cheap (er, chip)

O'Reilly Developer Weblogs |  Mobile & Wireless

A casual, but inventive hacker may probe your network with a Pringles Cantenna - an ultracheap Yagi-type directional antenna that can be built for under $10. All that's required is PVC, all-thread washers, some cheap copper tubing, a Pringles can, and some scrap cardboard.

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