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  2. Radio masts and towers - Wikipedia

    en.wikipedia.org/wiki/Radio_masts_and_towers

    For transmissions in the shortwave range, there is little to be gained by raising the antenna more than a half to three quarters of a wavelength above ground level, and at lower frequencies and longer wavelengths, the height becomes infeasibly great (greater than 85 metres (279 ft)). Shortwave transmitters rarely use masts taller than about 100 ...

  3. Effective height - Wikipedia

    en.wikipedia.org/wiki/Effective_height

    In telecommunications, the effective height of an antenna is the height of the antenna's center of radiation above the ground. In low-frequency applications involving loaded or nonloaded vertical antennas, the effective height is the moment of the current distribution in the vertical section, divided by the input current. For an antenna with a ...

  4. Today (American TV program) - Wikipedia

    en.wikipedia.org/wiki/Today_(American_TV_program)

    Today (also called The Today Show) is an American morning television show that airs weekdays from 7:00 a.m. to 11:00 a.m. on NBC.The program debuted on January 14, 1952. It was the first of its genre on American television and in the world, and after 73 years of broadcasting it is fifth on the list of longest-running American television serie

  5. 2020–21 United States network television schedule (daytime)

    en.wikipedia.org/wiki/2020–21_United_States...

    The schedule is followed by a list per network of returning series; no new series, but only one series is canceled after the 2019–20 season are included at present, as the daytime schedules of the four major networks that offer morning and/or afternoon programming is expected to remain consistent with the prior television season.

  6. WSM (AM) - Wikipedia

    en.wikipedia.org/wiki/WSM_(AM)

    When the tower was built in 1932, it was 878 feet (267.6m) tall and was the tallest antenna in North America. Its height was reduced to 808 feet (246 m) in 1939 when it was discovered that the taller tower was causing self-cancellation in the "fringe" areas of reception of the station (it is now known that 195 electrical degrees, about 810 feet ...

  7. Television antenna - Wikipedia

    en.wikipedia.org/wiki/Television_antenna

    The antenna can have a smaller or larger number of rod elements; in general, the more elements, the higher the gain and the more directional. Another design used mainly for UHF reception is the reflective array antenna, consisting of a vertical metal screen with multiple dipole elements mounted in front of it.

  8. Height above average terrain - Wikipedia

    en.wikipedia.org/wiki/Height_above_average_terrain

    Height above average terrain (HAAT), or (less popularly) effective height above average terrain (EHAAT), is the vertical position of an antenna site above the surrounding landscape. HAAT is used extensively in FM radio and television , as it is more important than effective radiated power (ERP) in determining the range of broadcasts ( VHF and ...

  9. WMAQ-TV - Wikipedia

    en.wikipedia.org/wiki/WMAQ-TV

    The show moved production to Stamford, Connecticut, in 2009, and ended in 2018. [15] On June 5, 2000, to improve station reception, the station extended its Sears Tower (now Willis Tower) transmitter's western antenna height to 1,730 feet (527 m). [16]