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They work great, but you have to get a can with the right diameter for your cell phone frequency. Just find out the frequency your phone operates at and use the size calculator on the first link you showed. Depending on the model of your phone you're going to need an adapter to connect the antenna to your phone.
After that just point it at the cell tower and you're off.
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"Empirically observed covariation is a necessary but not sufficient condition for causality" - Edward Tufte
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