Pringles ones are crap, but I can attest to the power of Illys based antennas, having done one exactly like this for a half mile line of site link to a public wifi hotspot about 8 years ago. Eventually I swapped it out for a sky mini-dish with usb wifi dongle and a small biscuit tin lid as a back reflector, as the Illys can dropped out too much in bad weather.

[edit] Woks with usb wifi dongles are also pretty good.