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shockwave,
look at how ez-nec handles transmissionlines and closely spaced wires, it shows a j-pole as an example,
heres what nec says about closely spaced wires,

Closely Spaced Wires Closely Spaced Wires

When modeling parallel or nearly parallel wires which are closely spaced, it can be very important to align the segment junctions. That is, they should be directly across from each other. This is particularly true if the segment length is greater than the line spacing. As the segment length gets shorter compared to the wire spacing, this requirement becomes less important. When segment junctions are misaligned but need to be aligned, results can change dramatically as segmentation is changed.
The easiest way to assure that aligned parallel wires have aligned segment junctions is to give the wires identical lengths and numbers of segments. If the wires are staggered or different lengths, break them into more wires. Make the portions of the wires which are directly across from each other into separate wires of equal length and number of segments. An example of this technique is shown below, where the long wire of a J-pole antenna was broken into two wires. Wire 4 is made the same length and given the same number of segments as parallel wire 6. The upper wire is segmented to make its segment length approximately equal to the segment length on wire 4. (This is a close up view – some of the long wire, and its number, aren't shown.)

<blockquote data-quote="bob85" data-source="post: 212141" data-attributes="member: 18">shockwave,look at how ez-nec handles transmissionlines and closely spaced wires, it shows a j-pole as an example, heres what nec says about closely spaced wires,Closely Spaced Wires&nbsp; Closely Spaced Wires&nbsp;When modeling parallel or nearly parallel wires which are closely&nbsp; spaced, it can be very important to align the segment junctions. That is, they&nbsp; should be directly across from each other. This is particularly true if the&nbsp; segment length is greater than the line spacing. As the segment length gets&nbsp; shorter compared to the wire spacing, this requirement becomes less important.&nbsp; When segment junctions are misaligned but need to be aligned, results can change&nbsp; dramatically as segmentation is changed.&nbsp;The easiest way to assure that aligned parallel wires have aligned&nbsp; segment junctions is to give the wires identical lengths and numbers of&nbsp; segments. If the wires are staggered or different lengths, break them into more&nbsp; wires. Make the portions of the wires which are directly across from each other&nbsp; into separate wires of equal length and number of segments. An example of this&nbsp; technique is shown below, where the long wire of a J-pole antenna was broken&nbsp; into two wires. Wire 4 is made the same length and given the same number of&nbsp; segments as parallel wire 6. The upper wire is segmented to make its segment&nbsp; length approximately equal to the segment length on wire 4. (This is a close up&nbsp; view – some of the long wire, and its number, aren&#039;t shown.)</blockquote>

[QUOTE="bob85, post: 212141, member: 18"] shockwave, look at how ez-nec handles transmissionlines and closely spaced wires, it shows a j-pole as an example, heres what nec says about closely spaced wires, Closely Spaced Wires [B]Closely Spaced Wires[/B] When modeling parallel or nearly parallel wires which are closely spaced, it can be very important to align the segment junctions. That is, they should be directly across from each other. This is particularly true if the segment length is greater than the line spacing. As the segment length gets shorter compared to the wire spacing, this requirement becomes less important. When segment junctions are misaligned but need to be aligned, results can change dramatically as segmentation is changed. The easiest way to assure that aligned parallel wires have aligned segment junctions is to give the wires identical lengths and numbers of segments. If the wires are staggered or different lengths, break them into more wires. Make the portions of the wires which are directly across from each other into separate wires of equal length and number of segments. An example of this technique is shown below, where the long wire of a J-pole antenna was broken into two wires. Wire 4 is made the same length and given the same number of segments as parallel wire 6. The upper wire is segmented to make its segment length approximately equal to the segment length on wire 4. (This is a close up view – some of the long wire, and its number, aren't shown.) [/QUOTE]

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