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A mast radiator or mast antenna is a radio tower or mast in which the whole structure is an antenna. Mast antennas are the transmitting antennas typical for long or medium wave broadcasting. Structurally, the only difference is that some mast radiators require the mast base to be insulated from the ground.
The Hellissandur longwave radio mast (Icelandic: Langbylgjustöðin á Gufuskálum [ˈlauŋkˌpɪlcʏˌstœːðɪn auː ˈkʏːvʏˌskauːlʏm]) is a 412 m (1,352 ft) tall guyed radio mast formerly used for longwave radio transmissions of RÚV (The Icelandic National Broadcasting Service).
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 ...
Outdoor antennas are more expensive and difficult to install but are necessary for adequate reception in fringe areas far from television stations; the most common types of these are the Yagi, [2] log periodic, [2] and (for UHF) the multi-bay reflective array antenna.
Antenna farms have often been the source of complaints from local neighborhoods, particularly when a new tower is added. This has been increasingly so for TV stations, which have been pursuing with alacrity the construction of new digital television antennas. Because many of these towers are already full, or were built well before there was the ...
Antennas are generally sensitive to signals only when they have a length that is a significant portion of the wavelength, or larger. Most antennas are at least 1 ⁄ 4 of the wavelength, more commonly 1 ⁄ 2 – the half-wave dipole is a very common design. For longwave use, this resulted in loop antennas tens of feet on a side, often with ...
The Very Low Frequency (VLF) antennas are large spider webs of wire supported in a top hat arrangement. The centre tower 'Tower Zero', rises to a height of 387.4 metres. The other towers are spread out in two concentric rings around Tower Zero; the towers of the inner ring are 303.5 metres high while those of the outer ring are 358.
The system had 120 high band antennas and 40 low band antennas which had to be positioned within +/- two minutes of arc and +/- 3 inches of their intended distance from the center of the array. 160 75 ohm coaxial transmission lines were used to carry signals from the antennas had to be electrically matched to within 3/4 of a degree at 10 MHz.