Ten years ago, over a hot 4th of July weekend, a few of us “alpha geeks” were hanging out on Rob Flickenger‘s porch in Sebastopol, CA testing out homebrew microwave antennas when we stumbled upon the fact that you could squeeze about 12db out of an empty Pringles can and some miscellaneous hardware. At the time, antennas of similar gain would set you back about $150. With our design, you could build two for about $10 (one for each end).