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I looked at your article and it's nothing more than stacking 1/2 waves over an existing 1/2 wave radiator to form 3 sections. EZNEC will lie to you an report those very same collinear sections with their 180 degree phase delays will work on the Sigma too. Try that in the field and you will quickly see who is right.

 

You can add the collinear sections shown in that article to the Sigma but they will only work on the real antenna when you cut the phasing sections in half regardless of what the terribly flawed EZNEC models continuously report. Once again the reason is simple. The Sigma is not a 1/2 wave radiator like the J-pole in your example. The Sigma is the 3/4 wave radiator is has always claimed with a 90 degree phase correction taking place at the base.

 

PS: As much as you would prefer to claim my response is just words like your ideas, I must remind you that my words form a test that can be replicated in the field to prove the 90 degree phase discrepancy with EZNEC. Your words stop right there with nothing to back them or tests to confirm them because the idea is incorrect.