A recent windows shopping at the CompUSA revealed so many different types of wireless networking devices, but there is one that I find curiously missing. Unidirectional attennae. You know, the type of attenna that can be self-made with a empty potato chip container? Why is that? I have seen these unidirectional attenna in action, they do transmit the signal for a mile. But why haven't the likes of Linksys come out with them? FCC regulation restriction?