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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. Joint Polarization Experiment - Wikipedia

   en.wikipedia.org/wiki/Joint_Polarization_Experiment

   The Joint Polarization Experiment (JPOLE) was a test for evaluating the performance of the WSR-88D in order to modify it to include dual polarization.This program was a joint project of the National Weather Service (NWS), the Federal Aviation Administration (FAA), and the US Air Force Meteorological Agency (AFWA), which took place from 2000-2004.

4. 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.

5. Talk:J-pole antenna - Wikipedia

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

   The first quarter was the matching stub and the half wave section with one side of the feedline removed was the end fed radiator. It was simply left to trail from the air ship at altitude. This Zepp Antenna later became known as a J Pole and or Slim Jim. Indeed - the stub is both an impedence match and a transfomer.

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

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

   The diagram shows the standing waves of voltage (V, red bands) and current (I, blue bands) on the antenna elements. It consists of a vertical element a half wavelength ( λ / 2 {\displaystyle \lambda /2} ) long, fed in series with a quarter wavelength ( λ / 4 {\displaystyle \lambda /4} ) transmission line stub , with the parallel wire feedline ...