The cantenna is basically a cross between a can and an antenna. This homebrew contraption is used to increase wireless reception in place of an antenna from a wireless device.
Andrew Clapp is credited with creating the first cantenna from a Pringles can, and Rob Frickenger shortly after improved the design using a coffee can. It is now a sort of trendy Do-It-Yourself hobbiest activity. Anybody can build one however hooking it up is still just barely less expensive than buying a market worthy range extender.
Cantenna building is not as easy a task as it looks though, the measurements must be precise and one lousy bus in the way could interfere with your improved signal completely. It’s not for the meager, those of you who give up easily avoid trying it. A good cantenna may take several attempts, a whole lot of persistence is involved.
For more history, facts or other relevant information on cantenna’s check out these links – - trust me these cantenna mounting geek squads know way more than I could ever learn about cantennas.