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Henry, EZNEC has done a good job modeling just about every collinear antenna I've tried except the Sigma. If you build a collinear Sigma in EZNEC it will show maximum gain with the phasing section 100% longer than what works in the field.

That is a huge miscalculation that strongly suggests to me that EZNEC is not accounting for the radiation in the cone because the phase is off by the exact 90 degrees worth of radiation in the cone.

Sharing my model won't help to confirm the error in EZNEC. That will require building the antenna and field testing it. Only then will you see that the 180 degree phasing section that works in EZNEC is a complete flop in the field.

[QUOTE="Shockwave, post: 415555, member: 10882"] Henry, EZNEC has done a good job modeling just about every collinear antenna I've tried except the Sigma. If you build a collinear Sigma in EZNEC it will show maximum gain with the phasing section 100% longer than what works in the field. That is a huge miscalculation that strongly suggests to me that EZNEC is not accounting for the radiation in the cone because the phase is off by the exact 90 degrees worth of radiation in the cone. Sharing my model won't help to confirm the error in EZNEC. That will require building the antenna and field testing it. Only then will you see that the 180 degree phasing section that works in EZNEC is a complete flop in the field. [/QUOTE]

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