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Goliath used three umbrella antennas, which were arranged radially around three 210 m (690 ft) tall guyed steel tube masts and were insulated against the ground. At their edges, these antennas were mounted on grounded 170 m (560 ft) tall guyed lattice steel masts.
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A sailboat's mast is supported by shrouds (side-to-side) and stays (fore-and-aft) – nautical equivalents of guy wires.. A guy-wire, guy-line, guy-rope, down guy, or stay, also called simply a guy, is a tensioned cable designed to add stability to a freestanding structure.
Guyed masts are frequently used for radio masts and towers. The mast can either support radio antennas (for VHF, UHF and other microwave bands) mounted at its top, or the entire structure itself can function as a mast radiator antenna (for VLF, LF, MF). In the latter case, the mast needs to be insulated from the ground. Guyed radio masts are ...
main mast of Shaanxi No.10 Transmitting Station, Chunhua, Xianyang, Shaanxi, China: May 2, 1982 [10] Guyed steel lattice mast 129 [11] High winds and corrosion Senior Road Tower, Missouri City, Texas, US December 7, 1982: Guyed steel lattice mast 569 Guy support wire severed Total collapse during installation of 6-ton FM antenna on new 1800 ft ...
The antenna used for broadcasting through the 1920s was the T-antenna, which consisted of two masts with loading wires on top, strung between them, requiring twice the construction costs and land area of a single mast. [2] (pp 77–78) In 1924 Stuart Ballantine published two historic papers which led to the development of the single mast antenna.
A schedule of ship's boats of 1886 shows 34 to 30 feet (10.4 to 9.1 m) cutters pulling 12 oars, 28 feet (8.5 m), 10 oars, 26 to 20 feet (7.9 to 6.1 m), 8 oars and the two smallest sizes of 18 and 16 feet (5.5 and 4.9 m), 6 oars. The smaller boats could be single banked whilst the larger and later examples were generally double-banked. For ...
By 1930 the disadvantages of the T antenna led broadcasters to adopt the mast radiator antenna. [9] One of the first types used was the diamond cantilever or Blaw-Knox tower. This had a diamond (rhombohedral) shape which made it rigid, so only one set of guy lines was needed, at its wide waist. The pointed lower end of the antenna ended in a ...
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