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2. G5RV antenna - Wikipedia

   en.wikipedia.org/wiki/G5RV_antenna

   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 frequencies require a transmatch. [citation needed] There are many variants of the G5RV antenna. Two variations of the G5RV design, called ZS6BKW ...

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. Umbrella antenna - Wikipedia

   en.wikipedia.org/wiki/Umbrella_antenna

   Buried in the ground under the antenna is an enormous radial ground system, which forms the bottom 'plate' of the capacitor with the overhead top load. 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.

5. 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.

6. Mast radiator - Wikipedia

   en.wikipedia.org/wiki/Mast_radiator

   Shunt excited: the bottom of the mast is grounded, and one side of the feedline is connected to the mast part way up, and the other to the ground system under the mast. [6] The impedance of the mast increases along its length, so by choosing the right height to connect, the antenna can be impedance matched to the feedline.

7. 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]