Make a 16 DBI WiFi antenna for less than $10 dollars with this hacker's how-to video. To get started building your own super WiFi antenna, which will provide you with something on the order of six times more power than a standard antenna, you'll need the following materials: (1) packaging foam (35 millimeters/1.4 inches or thicker), (2) 1.5 square mm copper wire, (3) two BNC connectors—a chassis part and a cable part—, and (5) a thin brass plate measuring approximately 12.5 by 12.5 centimeters (roughly 5 inches squared). For complete, step-by-step instructions on building your own $10 ultra high-gain wireless antenna, take a look at this video tutorial.