Yagi antenna can be used at transmission or reception but are more used for transmitters. This antenna
is a directional system consisting of an array of a dipole and a reflector and one or more directors.
The dipole in the array is driven, and another element, 5% longer, operates as a reflector. This arrangement gives the antenna directionality that a single dipole lacks.
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The antenna gain is a function of the number of dipole elements : GT = 1.66 * N where N is the number of elements in the Yagi antenna.