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  2. Yagi–Uda antenna - Wikipedia

    en.wikipedia.org/wiki/YagiUda_antenna

    A modern high-gain UHF Yagi television antenna with 17 directors, and one reflector (made of four rods) shaped as a corner reflector Drawing of Yagi–Uda VHF television antenna from 1954, used for analog channels 2–4, 54–72 MHz (U.S. channels).

  3. Quad antenna - Wikipedia

    en.wikipedia.org/wiki/Quad_antenna

    A quad antenna is a type of directional wire radio antenna used on the HF and VHF bands. A quad is a Yagi–Uda antenna ("Yagi") made from loop elements instead of dipoles: It consists of a driven element and one or more parasitic elements; however in a quad, each of the loop elements may be square, round

  4. Television antenna - Wikipedia

    en.wikipedia.org/wiki/Television_antenna

    Outdoor antenna designs are often based on the Yagi–Uda antenna [16] or log-periodic dipole array (LPDA). [17] These are composed of multiple half-wave dipole elements, consisting of metal rods approximately half of the wavelength of the television signal, mounted in a line on a support boom.

  5. Moxon antenna - Wikipedia

    en.wikipedia.org/wiki/Moxon_antenna

    It is a two element Yagi-Uda antenna with folded dipole elements, and no director(s). Because of the folded ends, the element lengths are approximately 70% of the equivalent dipole length. The two-element design gives modest directivity (about 2.0 dB ) with a null towards the rear of the antenna, yielding a high front-to-back ratio : Gain up to ...

  6. Driven and parasitic elements - Wikipedia

    en.wikipedia.org/wiki/Driven_and_parasitic_elements

    Drawing of a Yagi–Uda VHF television antenna used for analog channels 2–4, 54–72 MHz (U.S. channels). It has four parasitic elements: three directors (to left) and one reflector (to right) and one driven element which is a folded dipole (double rod) connected to a 300 Ω twin lead feedline down the mast to the television set.

  7. Antenna types - Wikipedia

    en.wikipedia.org/wiki/Antenna_types

    Quad antennas are Yagi-Uda antennas made from loops instead of dipoles or monopoles, and are likewise used as a directional antennas on the HF bands for shortwave communication. They are sometimes preferred for longer wavelengths because (if square) they are half as wide as a Yagi built from dipoles and have slightly better directivity.

  8. File:Yagi uda antenna.jpg - Wikipedia

    en.wikipedia.org/wiki/File:Yagi_uda_antenna.jpg

    English: Two Yagi-Uda television antennas. The top one consists of three parallel UHF Yagi beam antennas in front of a corner reflector. The lower one consists of a 5 element VHF antenna mounted in vertical polarization.

  9. Antenna (radio) - Wikipedia

    en.wikipedia.org/wiki/Antenna_(radio)

    Polar plots of the horizontal cross sections of a (virtual) Yagi–Uda antenna. The outline connects points with equal field power. The radiation pattern of an antenna is a plot of the relative field strength of the radio waves emitted by the antenna at different angles in the far field. It is typically represented by a three-dimensional graph ...

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