WiFi antenna made from Pepperidge Farm Pirouette Cookie Can. This article will describe how to make a cheap, portable, high performance (15-18 db) directional antenna out of commonly available parts that can be purchased in most grocery and hardware stores. Link.

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The best summary of home build WiFi antennas I’ve found is here.
http://www.lincomatic.com/wireless/homebrewant.html
I’ve had good success with a cantenna made from a premium Whisky container, the Bi-Quad and the Patch. The Toothpick and Omni designs were a waste of time giving too little gain for the effort.