The tin-can antenna

The tin-can antenna: A boon for third world - Technology - International Herald Tribune: "A physics research institute here is using a low-cost but effective tool to bolster communications in developing countries: the tin-can antenna. The cantenna has been around for years, but in Trieste it was fine-tuned by Rob Flickenger, the co-founder of NoCat, a California-based wireless company that promotes open-source software."