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Build a Yagi-Uda Antenna

Build a Yagi-Uda Antenna

Often one needs to improve reception of a particular radio or television station. One effective way to do this is to build a Yagi-Uda, or Yagi, antenna.
This is a traveling-wave? structure which, as the number of elements increases, has improved directivity, gain, and front-to-back ratio (and additional sidelobes).? The basic antenna is composed of one reflector (in the rear), one driven element, and one or more directors (in the direction of transmission/reception).? The “zero-order” version of the Yagi has all elements one-half wavelength long and spaced one-quarter wavelength apart.? The two designs presented here – a 3-element and a 6-element antenna – have been optimized for improved all-around performance, so their lengths and spacings are non-uniform.

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