ALEX BARTEL / SCIENCE PHOTO LIBRARY ALEX BARTEL / SCIENCE PHOTO LIBRARY
Television aerial on a rooftop mast. This aerial (upper centre) is raised on a mast to improve the reception of the television signal. The shape and arms of the aerial allow variations in the signal to be detected. These carry the information needed to reconstruct a visual image on the television sets in the building below. Photographed in Paris, France.
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