Make your own Wi-Fi antenna from an empty pringles can. Keep in mind that this won’t provide you with a free connection — just a stronger signal. In fact, DIY blogger John Graham-Cumming found 97 networks  pointing the can in one direction, compared to only 58 networks using a standard antenna.
From start to finish, the entire project will cost about $5 to $10, versus upward of $100 for a brand-new commercial Wi-Fi antenna.
June 12, 2012