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2. Umbrella antenna - Wikipedia

   en.wikipedia.org/wiki/Umbrella_antenna

   The umbrella wires may also serve structurally as guy lines to support the mast. There are several different methods of feeding power from the transmitter to the antenna: In base feed, the mast is supported on a thick ceramic insulator which keeps it insulated from the ground, and the feedline from the transmitter is attached to the base of the ...

3. T2FD antenna - Wikipedia

   en.wikipedia.org/wiki/T2FD_antenna

   The commercially available B&W AC3-30 and B&W DS1.8-30 antennas [6] vary from the above to cover 3–30 MHz using a 90 foot length with an 18 inch spacing of the wires. The balun is a 16:1 ratio, thereby transforming the 50 Ω (ohm) coax to an 800 Ω feed at the antenna.

4. Antenna types - Wikipedia

   en.wikipedia.org/wiki/Antenna_types

   It is usually fed at its center with the feedline cable itself slanting away at a perpendicular counter-slope from the sloping antenna wire, towards a small pole or a ground anchor near the base of the mast. [e] The sloper's far end is attached by a cord to a short pole or fastened by an insulated cord to a ground anchor. It is popular because ...

5. Television antenna - Wikipedia

   en.wikipedia.org/wiki/Television_antenna

   It is constructed of two telescoping rods attached to a base, which extend out to about 1 m (3.3 feet) length (approximately one-quarter wavelength at 54 MHz) and can be collapsed when not in use. For best reception, the rods should be adjusted to be a little less than ⁠ 1 / 4 ⁠ wavelength at the frequency of the television channel being ...

6. Umbrella - Wikipedia

   en.wikipedia.org/wiki/Umbrella

   Parts of an umbrella [2]. The word parasol is a combination of the Latin parare, and sol, meaning 'sun'. [3] Parapluie (French) similarly consists of para combined with pluie, which means 'rain' (which in turn derives from pluvia, the Latin word for rain); the usage of this word was prevalent in the nineteenth century.

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