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A modern high-gain UHF Yagi television antenna with 17 directors, and one reflector (made of four rods) shaped as a corner reflector Drawing of Yagi–Uda VHF television antenna from 1954, used for analog channels 2–4, 54–72 MHz (U.S. channels).
A Winegard 68 element VHF/UHF aerial antenna. This common multi-band antenna type uses a UHF Yagi at the front and a VHF log-periodic at the back coupled together. When a higher-gain antenna is needed to achieve adequate reception in suburban or fringe reception areas, an outdoor directional antenna is usually used.
A directive antenna with moderate gain of about 8 dBi often used at UHF frequencies. Consists of a dipole mounted in front of two reflective metal screens joined at an angle, usually 90°. Used as a rooftop UHF television antenna and for point-to-point data links. Parabolic The most widely used high gain antenna at microwave frequencies and above.
It was originally used to transmit Southern Television, and later TVS, until the end of VHF television transmissions in the UK at the beginning of 1985. It now transmits Greatest Hits Radio, Capital South, Nation Radio South Coast, Isle of Wight Radio, the local Arqiva (NOW S. Hampshire) DAB multiplex and the national Digital One DAB multiplex.
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.
A T-aerial was suspended between two masts, each 500 ft high and spaced by 800 ft. The Daventry transmitter took over from Chelmsford on 27 July 1925, radiating with a power of 25 kW. The initial frequency was 187.5 kHz, but this was changed to 187 kHz in 1927, 193 kHz in 1929, and finally 200 kHz in 1934.