Antenna
A device that radiates electrical signals as electromagnetic waves and converts incoming waves back into electrical signals. It is a core component of radio, broadcasting, and radar equipment.
The Yagi-Uda antenna, invented in Japan in 1926, was vital for radar, but Japan ignored it. Britain used it to gain a decisive edge in World War II. At Singapore, Japanese soldiers found "Yagi" in a British technician's notes—and asked him what it meant.
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