Learn how to build a simple cantenna to boost your wifi signal for under five dollars. Extend your range for your next war driving trip or WEP hacking excursion. Sure, you can purchase a commercial antenna, or you can make your own, the DIY way. This design is based on a “cantenna”, a antenna made out of a tin food can. Best of all, you’ll only be spending about five dollars on parts, and reusing a can. So go ahead, learn how to build a tin can antenna.