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The 4nec2 software has a “geometry builder” section that allows you to build a helix. The inputs are “diameter” and the number of “wires per turn”. As it works out, the wire junctions lie on a 12″ circle. Increasing the “wires per turn” results in more wires, but their intersections still lie on the 12″ circle. Since the “geometry builder” feature isn’t part of the standard NEC software, the “diameter” may be defined differently in various programs, but my results were based on the 4 points of the square lying on a 12″ diameter circle.
Hope this is clear.