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2. Counterpoise (ground system) - Wikipedia

   en.wikipedia.org/wiki/Counterpoise_(ground_system)

   Counterpoises are typically used in antenna systems for radio transmitters where a good earth ground connection cannot be constructed.. Monopole antennas used at low frequencies, below 3 MHz, such as the mast radiator antennas used for AM broadcasting, require the radio transmitter to be electrically connected to the Earth under the antenna; this is called a ground (or earth).

3. Antenna rotator - Wikipedia

   en.wikipedia.org/wiki/Antenna_rotator

   An antenna rotator (or antenna rotor) is a device used to change the orientation, within the horizontal plane, of a directional antenna. Most antenna rotators have two parts, the rotator unit and the controller. The controller is normally placed near the equipment which the antenna is connected to, while the rotator is mounted on the antenna ...

4. Umbrella antenna - Wikipedia

   en.wikipedia.org/wiki/Umbrella_antenna

   Umbrella antennas are good ground wave antennas, and are used as radio broadcasting antennas in the MF and LF bands. The gain of an umbrella antenna over perfectly conducting ground, like other electrically short monopole antennas, is approximately 3.52 dBi if it is significantly shorter than 1 4 λ . {\displaystyle {\tfrac {1}{4}}\lambda ~.}

5. Antenna types - Wikipedia

   en.wikipedia.org/wiki/Antenna_types

   This article provides a summary description of many of the different antenna types used for radio receiving or transmitting systems. Different types of antennas are made with properties especially optimized for particular uses, and the electrical design of antennas serves as a way to group them:

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7. Radio masts and towers - Wikipedia

   en.wikipedia.org/wiki/Radio_masts_and_towers

   Masts of the Rugby VLF transmitter near Rugby, England. By 1930 the expense of the T-antenna led broadcasters to adopt the mast radiator antenna, in which the metal structure of the mast itself functions as the antenna. [2] (pp 79–81) One of the first types used was the diamond cantilever or Blaw-Knox tower.

8. Monopole antenna - Wikipedia

   en.wikipedia.org/wiki/Monopole_antenna

   A typical mast radiator monopole antenna of an AM radio station in Chapel Hill, North Carolina. The mast itself is connected to the transmitter and radiates the radio waves. It is mounted on a ceramic insulator to isolate it from the ground. The other terminal of the transmitter is connected to a ground system consisting of cables buried under ...

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