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The T-antenna is an omnidirectional antenna, radiating equal radio power in all azimuthal directions, while the inverted-L is a weakly directional antenna, with maximum radio power radiated in the direction of the top load wire, off the end with the feeder attached. Multiwire broadcast T-antenna of early AM station WBZ, in Springfield, MA, 1925.
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.
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.
Molonglo (near Canberra, Australian Capital Territory) 600–1200 MHz Operated by the School of Physics at the University of Sydney. East-west arm of the former Molonglo Cross Telescope, approximately 1.6 km in length. Operates at 843 MHz. Mopra Radio Telescope Mopra Observatory, near Coonabarabran, New South Wales 0.3–100 GHz
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Omnidirectional antenna, 257 m high guyed lattice steel mast with cage antenna ( ARRT-antenna) 150 61°49′9.34″N 50°41′26.42″E / 61.8192611°N 50.6906722°E / 61.8192611; 50.6906722 ( Zelenets longwave transmitter
It's on sale in both brown and black in sizes 34 to 48. Duluth is known for its durability, so this belt in particular is great for long wear and high impact work. $36 at Duluth Trading
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]
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