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lol, don't tell eddie he can't do something:sneaky2:,
i commend you on your efforts with modeling the sigma design especially given that you so far have not seen the advantage the sigma design demonstrates over groundplanes at your location which would lead average joe to give up,

i don't understand nec but what cebik told me made me look at what some of the gurus had to say about different parts of the antenna and came to the conclusion that the tapers, unequal diameters, unequal segment lengths, sharp folds, round hoop plus the angled tubular gamma could all cause errors in nec and i don't know how to work around those issues or how much they will effect the results,

i would like to see what your nec model says happens when the monopole is extended to about 30ft with 90" radials,
ezbob predicts that extending the monopole will increase distance between the two current maximas and skew the phase relationship in the lower 1/4wave which may cause the results we see in field tests

<blockquote data-quote="bob85" data-source="post: 242954" data-attributes="member: 18">lol, don&#039;t tell eddie he can&#039;t do something:sneaky2:,i commend you on your efforts with modeling the sigma design especially&nbsp; given that you so far have not seen the advantage the sigma design&nbsp; demonstrates over groundplanes at your location which would lead average&nbsp; joe to give up,i don&#039;t understand nec but what cebik told me made me look at what some&nbsp; of the gurus had to say about different parts of the antenna and came to the conclusion that the tapers,&nbsp; unequal diameters, unequal segment lengths, sharp folds, round hoop plus&nbsp; the angled tubular gamma could all cause errors in nec and i don&#039;t know&nbsp; how to work around those issues or how much they will effect the&nbsp; results,i would like to see what your nec model says happens when the monopole is extended to about 30ft with 90&quot; radials, ezbob predicts that extending the monopole will increase distance between the two current maximas and skew the phase relationship in the lower 1/4wave which may cause the results we see in field tests<img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f44d.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":thumbup1:" title="Thumbs Up&nbsp; &nbsp; :thumbup1:"&nbsp; data-smilie="27"data-shortname=":thumbup1:" /></blockquote>

[QUOTE="bob85, post: 242954, member: 18"] lol, don't tell eddie he can't do something:sneaky2:, i commend you on your efforts with modeling the sigma design especially given that you so far have not seen the advantage the sigma design demonstrates over groundplanes at your location which would lead average joe to give up, i don't understand nec but what cebik told me made me look at what some of the gurus had to say about different parts of the antenna and came to the conclusion that the tapers, unequal diameters, unequal segment lengths, sharp folds, round hoop plus the angled tubular gamma could all cause errors in nec and i don't know how to work around those issues or how much they will effect the results, i would like to see what your nec model says happens when the monopole is extended to about 30ft with 90" radials, ezbob predicts that extending the monopole will increase distance between the two current maximas and skew the phase relationship in the lower 1/4wave which may cause the results we see in field tests:thumbup1: [/QUOTE]

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