Boosting WiFi signal strength by a Coke can

In today's Apple Daily News, there was a story about boosting WiFi receiving signal strength by means of placing a Coke can close to an antenna.  A picture is given below.

The distance between the aluminium foil and the whip antenna should be carefully calculated in order to maximize the directivity which as a norm is λ/2. For this TP-LINK 2.4 GHz router, the distance is (3x10^8/(2.4x10^9x2) = 0.0625 meter or 2.5 inches.

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