MIT Physics Demo -- Dipole Antenna

An RF transmitter is connected to a long antenna, emitting radio waves.  A dipole antenna with a light bulb between its elements acts as the receiver.  When the receiving antenna is parallel to the transmitter, the radio waves are absorbed, creating a current in the antenna and causing the bulb to glow.  When perpendicular, no current is created, and the bulb does not glow.
See the original video on MIT TechTV - http://techtv.mit.edu/videos/796

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