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2. Radio masts and towers - Wikipedia

   en.wikipedia.org/wiki/Radio_masts_and_towers

   A radio mast base showing how virtually all lateral support is provided by the guy-wires. The terms "mast" and "tower" are often used interchangeably. However, in structural engineering terms, a tower is a self-supporting or cantilevered structure, while a mast is held up by stays or guy-wires. [1] A mast

3. Voice of America Bethany Relay Station - Wikipedia

   en.wikipedia.org/wiki/Voice_of_America_Bethany...

   In 1963, VOA Radio took over, ending the lease with Crosley Corp. Due to changing technologies, transmissions shifted to satellites. The station was closed November 14, 1994, and the antenna towers brought down over the winter of 1997-1998. Through the Federal Lands to Parks Program, the site was divided into several uses.

4. Amateur radio repeater - Wikipedia

   en.wikipedia.org/wiki/Amateur_radio_repeater

   The actual frequency pair used is assigned by a local frequency coordinating council. In the days of crystal-controlled radios, these pairs were identified by the last portion of the transmit (Input) frequency followed by the last portion of the receive (Output) frequency that the ham would put into the radio. Thus "three-four nine-four" (34/94 ...

5. VLF Transmitter Cutler - Wikipedia

   en.wikipedia.org/wiki/VLF_Transmitter_Cutler

   The central tower of each antenna system is 304 m (997.4 ft) tall. It is surrounded by six 266.7 m (875 ft) tall masts, placed on a ring with a radius of 556 m around the central tower. The remaining six towers of the array are 243.5 m (799 ft) tall, placed on a circle of 935.7 m (3,070 ft) around the central tower.

6. Amateur radio - Wikipedia

   en.wikipedia.org/wiki/Amateur_radio

   This repeater is used and maintained by the National Emergency Management Agency (NEMA), but may be used by radio amateurs in times of emergency or during normal times to test their capability and conduct emergency drills. This repeater can also be used by non-ham NEMA staff and REACT members. In Australia and New Zealand, ham operators are ...

7. Guyed mast - Wikipedia

   en.wikipedia.org/wiki/Guyed_mast

   Partially guyed towers are typically used when a very high tower for FM and TV transmission is required, while also carrying antennas for directional radio services at a much lower height. 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 ...

8. List of longwave radio broadcasters - Wikipedia

   en.wikipedia.org/wiki/List_of_longwave_radio...

   Semi-directional Alexanderson antenna 153/333 degrees, two grounded 118 metres (387 ft) steel lattice radiating towers with interconnecting top wire capacitance 50 55°40′39.27″N 11°4′8.6″E  /  55.6775750°N 11.069056°E  / 55.6775750; 11.069056  ( Kalundborg Transmitter long-wave

9. List of catastrophic collapses of broadcast masts and towers

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

   The tower fell onto a nearby utility line which provided power to the remainder of Duluth's television and FM radio stations, and all but one AM radio station. Telephone and power lines snapped leaving Duluth and many northeastern Minnesota communities without utility services for 24 hours.