Yagi–Uda antennas consist of a single driven element connected to a radio transmitter and/or receiver through a transmission line, and additional " parasitic elements" with no electrical connection, usually including one so-called reflector and any number of directors. The beam direction (direction of greatest sensitivity) is to the left.Ī Yagi–Uda antenna or simply Yagi antenna, is a directional antenna consisting of two or more parallel resonant antenna elements in an end-fire array these elements are most often metal rods acting as half-wave dipoles. It has five elements: three directors ( to left) one reflector ( to right) and a driven element which is a folded dipole ( double rod) to match the 300 Ω twin lead feedline. Drawing of Yagi–Uda VHF television antenna from 1954, used for analog channels 2–4, 54–72 MHz (USA channels).
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