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English: A microwave relay tower on Granite Pass, Mojave National Preserve, California. This is part of the TD-2 AT&T Long Lines system, a microwave relay network created by AT&T in the 1950s to relay telephone calls and other data between cities in the USA. The four angular cone-shaped antennas are called horn-reflector antennas, invented by ...
The AT&T Madison Complex Tandem Office is a 17-story, 79 m (259 ft) building in Los Angeles, California, completed in 1961.With its microwave tower, used through 1993, bringing the overall height to 137 m (449 ft), it is the 47th tallest building in Los Angeles.
The specific uses of the tower today are classified. [5] It was rumored to be a government intelligence numbers station, although others argue that the tower's communications equipment is now obsolete. [4] Several microwave antennas have been removed from the tower, including those pointed to Mount Weather Emergency Operations Center.
A telecommunications tower with a variety of dish antennas for microwave relay links on Frazier Peak, Ventura County, California. The apertures of the dishes are covered by plastic sheets to keep out moisture. Microwave is a form of electromagnetic radiation with wavelengths shorter than other radio waves but longer than infrared waves.
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The first UK microwave relay towers were built in about 1952 for a television link between Manchester and Kirk o'Shotts near Glasgow. A chain of 14 towers, known as "Backbone", running from the Chilterns to Scotland and intended primarily for national defence in the Cold War , was first mentioned publicly in the 1955 Defence White Paper.