Here we see five variations on the basic J antenna (aka J-pole)

Key takeaways include:

  • The basic J and SlimJIM configurations operate identically for all practical purposes.
  • The Super J is an easy way to obtain gain towards the horizon.
  • The 5/8ths Super J represents the most bang for the buck for gain.
  • The Collinear J provides the benefits of the Super Js in a slim package.
  • If on a conductive mast (red) a mast decoupling stub (green) provides essential RF isolation while preserving a direct path to ground.

J_Antenna_Variations-1024x850

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