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In North America, for instance, there are transmitting antennas on the Empire State Building, the Willis Tower, Prudential Tower, 4 Times Square, and One World Trade Center. The North Tower of the original World Trade Center also had a 110-metre (360 ft) telecommunications antenna atop its roof, constructed in 1978–1979, and began ...
The tower consists of two parts: a lattice tower of 1,950 feet (590 m); [6] topped by the transmitting antenna array of 53 feet (16 m). The total height of both is 1,987 feet (606 m). The antenna weighs 9,000 pounds (4.1 t), the lattice tower weighs 855,500 pounds (388.0 t), giving a total weight of 864,500 pounds (392.1 t).
A mast radiator (or radiating tower) is a radio mast or tower in which the metal structure itself is energized and functions as an antenna. This design, first used widely in the 1930s, is commonly used for transmitting antennas operating at low frequencies , in the LF and MF bands, in particular those used for AM radio broadcasting stations.
The diamond-shaped tower was patented by Nicholas Gerten and Ralph Jenner for Blaw-Knox July 29, 1930. [5] and was one of the first mast radiators.[1] [6] Previous antennas for medium and longwave broadcasting usually consisted of wires strung between masts, but in the Blaw-Knox antenna, as in modern AM broadcasting mast radiators, the metal mast structure functioned as the antenna. [1]
A tower array is an arrangement of multiple radio towers which are mast radiators in a phased array. [1] They were originally developed as ground-based tracking radars. [2] Tower arrays can consist of free-standing or guyed towers or a mix of them. Tower arrays are used to constitute a directional antenna of a mediumwave or longwave radio station.
The radio frequency current from the transmitter is supplied to the antenna through a cable called the feedline.The antenna tuning hut contains a matching network made of high wattage capacitors and inductors (coils) that in combination match the antenna's impedance to the feedline, to efficiently transfer power into the antenna.
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WWRR Renda Tower Kingsland, Georgia: Guyed Mast 496 m QueenB Television Tower La Crosse, Wisconsin: Guyed Mast 496 m KDEB Tower: Fordland, Missouri: Guyed Mast 495 m WGME TV Tower: Raymond, Maine: Guyed Mast 495.9 m WPSD-TV Tower: Kevil, Kentucky: Guyed Mast 495.6 m NVG-Amarillo Tower Amarillo, Texas: Guyed Mast 493.5 m Sinclair Television ...
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