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First you need to determine what the impedance of the cantenna is supposed to be, this would be in the specs for the appropriate WIFI card you'll be using. Then working from that, select the gauge wire you'll be using and it's resistance per foot would give you the length of wire to use and then decide the size of can to use. I've made a few out of toilet paper rolls which is pretty close to the size used commerially, but maybe a paper towel roll or maybe a little larger paper coffee cups. The form must be non-metallic.