This saturday there was a special talk at Linux Cabal about building wifi cantenas. These are anthenas that are make with a Can.The talk was given by one of the members of Linux Cabal and it was interesting talk, he mention the difference on the wavelenght and frequency involved in Wireless conectivity. They mentioned about the world record on connectivity of 300km on a point to point conection with a big satelite dish. The guy that did the talk also had some reference into where to get this cantenas and the cabling that is required in order to set one up. I remember when I was living in New york we were looking at this stuff up in New York Wireless, a special interest group on wireless.