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eddie,
heres something you may like to read, it explains common mode currents and why mr cebik told me that getting accurate results when modeling the sigma style antennas with nec would be very difficult,
it also explains why just grounding your coax as some folk do and advise on forums may not be the best way forward,
i think the article also gives a clue as to what he meant by "there is more going on in that design than is apparent to most people" and the other things he told me.

http://www.cebik.com/content/a10/trans/cmp.html

[QUOTE="bob85, post: 280190, member: 18"] eddie, heres something you may like to read, it explains common mode currents and why mr cebik told me that getting accurate results when modeling the sigma style antennas with nec would be very difficult, it also explains why just grounding your coax as some folk do and advise on forums may not be the best way forward, i think the article also gives a clue as to what he meant by "there is more going on in that design than is apparent to most people" and the other things he told me. [URL]http://www.cebik.com/content/a10/trans/cmp.html[/URL] [/QUOTE]

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