There are also multiple active arrays of the yagi antenna. The distance between the pilot is also a quarter wavelength, the farther away from the element, the pilot should be shorter on the basis of the previous pilot. Increasing the number of the director can enhance the directionality and gain of the antenna, but it will also reduce the bandwidth and increase the difficulty of antenna coupling. The distance between the reflector and the element and the element and the diverter is a quarter of a wavelength. The length of the director is slightly less than half wavelength, the length of the reflector is slightly longer than half wavelength, and the specific length depends on the actual use of the situation. The simplest 3-element Yagi antenna consists of a dipole antenna (active element) of half wavelength in the middle and a director and a reflector in front and behind the dipole. The Yagi antenna, also is called Yagi-Uda antenna, is based on the development of a common dipole antenna.
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