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thanks for your input henry,
any work somebody does to try and understand the sigma style antenna is much apreciated by myself,

CEBIK called it a "none apparent colinear array" because he said it was not aparent to most people how they work, you seeing big changes in gain with changes in wire diameter could be the difficulty with trying to get accurate models with nec that he told me about,
i read that sleeve to monopole tube diameter ratios effect that style antennas performance, shockwave is on the right track imho

[QUOTE="bob85, post: 210924, member: 18"] thanks for your input henry:thumbup1:, any work somebody does to try and understand the sigma style antenna is much apreciated by myself, CEBIK called it a "none apparent colinear array" because he said it was not aparent to most people how they work, you seeing big changes in gain with changes in wire diameter could be the difficulty with trying to get accurate models with nec that he told me about, i read that sleeve to monopole tube diameter ratios effect that style antennas performance, shockwave is on the right track imho [/QUOTE]

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