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2. Tower array - Wikipedia

   en.wikipedia.org/wiki/Tower_array

   A tower array is an arrangement of multiple radio towers which are mast radiators in a phased array. They were originally developed as ground-based tracking radars. Tower arrays can consist of free-standing or guyed towers or a mix of them. Tower arrays are used to constitute a directional antenna of a mediumwave or longwave radio station.

3. NSS Annapolis - Wikipedia

   en.wikipedia.org/wiki/NSS_Annapolis

   The station consisted of an umbrella antenna supported by a 1,200-foot (365.76 m) high central mast, which was insulated against ground, 6 guyed masts of 800-foot (243.84 m) all of which were built in 1969 and three 600-foot freestanding towers built earlier. Originally the station consisted of nine 600-foot-tall self-supporting lattice towers ...

4. John Hancock Center - Wikipedia

   en.wikipedia.org/wiki/John_Hancock_Center

   Subsequently, the western antenna tower was reduced to a height of 285 feet (87 metres). [63] For a long time, the antenna towers utilized incandescent red lights and a red and white paint scheme to provide a visibility to aviation in compliance with federal regulations. However, in order to forgo the expense and effort of annually reapplying ...

5. Broadcast transmitter - Wikipedia

   en.wikipedia.org/wiki/Broadcast_transmitter

   The antenna pattern must be considered because it is costly to change the pattern of a long-wave or medium-wave antenna. Antenna guyed tower. Transmitting antennas for long and medium wave are usually implemented as a mast radiator. Similar antennas with smaller dimensions are used also for short wave transmitters, if these send in the round ...

6. Omega (navigation system) - Wikipedia

   en.wikipedia.org/wiki/Omega_(navigation_system)

   Omega stations used very extensive antennas to transmit at their very low frequencies (VLF). This is because wavelength is inversely proportional to frequency (wavelength in metres = 299,792,458 / frequency in Hz), and transmitter efficiency is severely degraded if the length of the antenna is shorter than 1/4 wavelength.

7. Tower of Power (transmitter) - Wikipedia

   en.wikipedia.org/wiki/Tower_of_Power_(transmitter)

   The Tower of Power is a 777 ft (236.8 m), 120,000 watt [1] TPO mast owned by the GMA Network located in Tandang Sora, Barangay Culiat, Quezon City.It serves as a transmitter facility for GMA's flagship stations, including DZBB-TV 7 (digital UHF 15), GTV's DWDB-TV 27, and Barangay FM's DWLS 97.1 MHz.