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2. J-pole antenna - Wikipedia

   en.wikipedia.org/wiki/J-pole_antenna

   The J-pole antenna is an end-fed omnidirectional half-wave antenna that is matched to the feedline by a shorted quarter-wave parallel transmission line stub. [5] [1] [6] For a transmitting antenna to operate efficiently, absorbing all the power provided by its feedline, the antenna must be impedance matched to the line; it must have a resistance equal to the feedline's characteristic impedance.

3. File:J-pole antenna diagram.svg - Wikipedia

   en.wikipedia.org/wiki/File:J-pole_antenna...

   English: Diagram of a J-pole antenna, a vertical end-fed half-wave omnidirectional transmitting antenna used in the shortwave frequency bands. It consists of a vertical element a half wavelength (/) long, fed in series with a quarter wavelength (/) transmission line stub, with the coaxial cable feedline (F) from the transmitter attached along the stub.

4. File:J-pole antenna showing standing waves 1.svg - Wikipedia

   en.wikipedia.org/wiki/File:J-pole_antenna...

   English: Diagram of a J-pole antenna, a vertical end-fed half-wave omnidirectional transmitting antenna used in the shortwave frequency bands. The diagram shows the standing waves of voltage (V, red bands) and current (I, blue bands) on the antenna elements.

5. Antenna types - Wikipedia

   en.wikipedia.org/wiki/Antenna_types

   A horn antenna has a flaring metal horn attached to a waveguide. It is a simple antenna with moderate gain of 15 to 25 dBi, used for applications such as radar guns, radiometers, and as feed antennas for parabolic dishes. Slot Consists of a waveguide with one or more slots cut in it to emit the microwaves. Linear slot antennas emit narrow fan ...

6. Talk:J-pole antenna - Wikipedia

   en.wikipedia.org/wiki/Talk:J-pole_antenna

   The diagram here is nice; I could add pictures, but the j-pole is large and difficult to photograph clearly. --ssd 22:17, 21 July 2007 (UTC) The J Pole or Zepp Antenna is a voltage fed antenna that was invented by the Germans (citation needed). It was first used on the Zepplin Ballon Air Ships (citation needed) hence the name Zepp Antenna.

7. Whip antenna - Wikipedia

   en.wikipedia.org/wiki/Whip_antenna

   If it was infinitely thin the antenna would have an infinite input impedance, but the finite width gives typical, practical half wave whips an impedance of 800–1,500 ohms. These are usually fed through an impedance matching transformer or a quarter wave stub matching section (e.g. the J-pole antenna). An advantage is that because it acts as a ...