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2. G5RV antenna - Wikipedia

   en.wikipedia.org/wiki/G5RV_antenna

   [9] [better source needed] A length of at least 20 metres (66 ft) of 75 Ω (50 Ω) cable is recommended for operation without a balun. [10] [11] A transmatch (antenna tuner) is not required to use this antenna near its nominal design frequency of 14 MHz, and judicious length adjustments can sometimes include one other frequency band. All other ...

3. Radio masts and towers - Wikipedia

   en.wikipedia.org/wiki/Radio_masts_and_towers

   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.

4. Moxon antenna - Wikipedia

   en.wikipedia.org/wiki/Moxon_antenna

   Moxon antenna for the 20-meter band.The antenna is the faint rectangle of wires held in tension by the bent X-shaped support frame. Moxon antenna for the 2-meter band. The Moxon antenna or Moxon rectangle is a simple and mechanically rugged two-element parasitic array, single-frequency antenna. [1]

5. KATV tower - Wikipedia

   en.wikipedia.org/wiki/KATV_tower

   The KATV tower was a 2,000-foot (610 m)-tall television mast (or antenna tower) built in 1965, which was located in Barraque Township, Arkansas, off of Arkansas Highway 365 (at [ 2 ] [ 3 ] At the time of its completion, it was the third-tallest human-made structure and second-tallest broadcast tower in the world (behind the 2,063-foot [629 m ...

6. Umbrella antenna - Wikipedia

   en.wikipedia.org/wiki/Umbrella_antenna

   The antenna must be very large at the VLF frequencies used; the supporting masts are 250–300 metres (820–980 ft) high, and the topload is about 1,900 metres (6,200 ft) in diameter. The trideco antenna was developed for high power naval transmitters, which transmit on frequencies between 15 and 30 kHz at powers up to 2 megawatts, to ...

7. List of catastrophic collapses of broadcast masts and towers

   en.wikipedia.org/wiki/List_of_catastrophic...

   Guyed steel lattice mast 150 Storm WDIO-TV Duluth, Minnesota, US March 23, 1991: Guyed steel triangular tower 259 Ice and high wind Freezing rain, accompanied at time with thunder, coated the city of Duluth with as much as six inches of ice. The 850-foot WDIO-TV tower was toppled as winds gusted to 40 mph, buffeting the heavily ice-covered tower.