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Japan. In 1926, Professor Hidetsugu Yagi and his assistant, Shintaro Uda published on the sensitive and highly-directional antenna they designed and constructed using closely-coupled parasitic elements. The antenna, which is effective in the higher-frequency ranges, has been important for radar, television, and amateur radio.
The 1924 Directional Antenna is an IEEE Milestone in Electrical Engineering and Computing.
Yagi, Hidetsugu. U.S. Patent No. 1,745,342, "Directive-Projecting System of Electric Waves", filed 3 September 1926.
________. U.S. Patent No. 1,860,123, "Variable Directional Electric Wave Generating Device", filed 3 September 1926.