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Here is a demonstration of Gi-Fi, or Gigabit Wireless. The golden triangle is sending a TV signal to the plate at the bottom of the photo, which is in turn appearing on the TV (as seen at the top). NICTA claims Gi-Fi can do in excess of three gigabits per second. Due to the high frequency of the signal produced, it is only intended to be used within a single room, and putting one's hand between the transmitter and receiver can interrupt the signal.
(Credit: Chris Duckett/ZDNet.com.au)