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2. Radio masts and towers - Wikipedia

   en.wikipedia.org/wiki/Radio_masts_and_towers

   Blaw-Knox towers Those few of the towers still standing do the opposite: They have a guyed lower section surmounted by a freestanding part. Zendstation Smilde is a tall tower with a guyed mast on top with guys which go to ground. Torre de Collserola is a guyed tower with a guyed mast on top where the tower portion is not free-standing.

3. Mast radiator - Wikipedia

   en.wikipedia.org/wiki/Mast_radiator

   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.

4. Guyed mast - Wikipedia

   en.wikipedia.org/wiki/Guyed_mast

   In such cases the antennas for directional radio services are mounted on the top of the free-standing part of the tower, while the guyed mast on its top carry the FM and TV antennas. They can be also used in order to upgrade small stable towers (like watertowers) with a long antenna mast for FM and TV broadcasting.

5. List of catastrophic collapses of broadcast masts and towers

   en.wikipedia.org/wiki/List_of_catastrophic...

   Free standing wood lattice tower 75 Storm Two towers snapped off 25 metres above ground Langenberg, Germany October 10, 1935: Free standing wood lattice tower 150 Tornado Replaced by triangle antenna Liechtenstein-Haberfeld transmitter November 21, 1938: Storm Utbremen Radio Tower, Bremen, Germany 1939: Free standing wood lattice tower 90 Lightning

6. Pylons of Messina - Wikipedia

   en.wikipedia.org/wiki/Pylons_of_Messina

   The two pylons, built in 1955, are both 232-metre-high (761 ft) free-standing steel towers. Each stands on an 8-metre-high (26 ft) cross-shaped base and is equipped with a crossbar that carries four conductors at a height of 212 metres (696 ft), and another V-shaped structure at the top which carries two additional conductors in addition to ...

7. Hellissandur longwave radio mast - Wikipedia

   en.wikipedia.org/wiki/Hellissandur_longwave...

   The LORAN-C scheme closed in 1994. In 1991, the original RÚV 1930 longwave transmitter tower at Vatnsendi (near Reykjavík) collapsed. As the Hellissandur mast was free for use, it was converted for use by RÚV (The Icelandic National Broadcasting Service) for its longwave transmissions on 189 kHz at a power of 300 kilowatts in the 1997. [2] [3]

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   mail.aol.com

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9. Counterpoise (ground system) - Wikipedia

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

   [citation needed] To perform adequately, the counterpoise should extend at least half a wavelength from the antenna tower in all directions. [8] In designing a counterpoise for a medium-wave radio station, for example, radio-waves are a maximum of 566 metres (1,857 ft) long. Therefore, the counterpoise should extend 282 metres (925 ft) from the ...