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The T-antenna is an omnidirectional antenna, ... It was a multiwire 'T' with a 50-metre (160 ft) vertical wire and four 120-metre (400 ft) horizontal wires.
Rebuilt in 2003, the new tower has almost the same height, i.e. 326.8 m (307.1 m for the structure, but the antenna is shorter (19.7 m)). Angara transmitter, Northern Mast, Angara, Russia June 6, 2001: Guyed steel lattice mast carrying a T-antenna 205 Deteriorated support guys World Trade Center North Tower, New York City, NY September 11, 2001
T-antennas have a height between 50–200 meters, while mast aerials are usually taller than 150 meters. The height of mast antennas for LORAN-C is around 190 meters for transmitters with radiated power below 500 kW, and around 400 meters for transmitters greater than 1 000 kilowatts. The main type of LORAN-C antenna is insulated from ground.
The 160-meter band is the oldest amateur band and was the staple of reliable communication in the earliest days of amateur radio, when almost all communications were over relatively short distances, and typical operating frequencies were below 20 MHz. In the UK 160 meters was the primary band used for mobile operation for many years.
Practical antennas at these frequencies are much shorter than the wavelength, making it difficult to efficiently radiate much useful power. By current U.S. and Canadian regulations, LowFER transmitters may not have antenna and feed line lengths longer than 15 metres (49 ft), or final RF stage input powers that exceeds 1 watt. [6]
As an "all-band" transceiver, the TS-2000 offers a maximum power output of 100 watts on the HF, 6 meters, and 2 meters bands, 50 watts on 70 centimeters, and, with the TS-2000X or the optional UT-20, 10 watts on the 1.2 GHz or 23 centimeters band. The (American version) radio's main receiver covers 30 kHz through 60 MHz, 142 MHz through 152 MHz ...
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The AT&T receiving Beverage antenna (left) and radio receiver (right) at Houlton, Maine, used for transatlantic telephone calls, from a 1920s magazine. The Beverage antenna or "wave antenna" is a long-wire receiving antenna mainly used in the low frequency and medium frequency radio bands, invented by Harold H. Beverage in 1921. [1]
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