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2 METER 1/2-WAVE J-POLE
VHF-FM Antenna Made From 450-Ohm LADDER LINE
Great first time J-pole project.  Covers most of the basics.
This small and thin design also makes it good for several stealth applications.
And......We've nicknamed this design the "LL-Coool-J"

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Comments section

 
This decoupling loop is sometimes mistaken for a matching balun.
We'll just call it a choke and not put everyone to sleep with a long discussion of antenna theory.  Just a few points on this topic..  Adding a choke like this is a good habit to get into.  Another idea for this is one of those plastic snap-on ferrite cores.  They come in different sizes depending on the size coax used.  Either way is up to you.  This J-pole is a balanced antenna going into an unbalanced feed line and can cause RF to get back into the Rig and into the shack.  Save your equipment and try to protect yourself... 
This is easy to do..  So, take this extra step..  Please be safe..

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