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Quote=radio8z: Do you think the effect of the 8″ radiator on Z would be approximated by several parallel wires spaced about 8″ apart in a cylindrical arrangement.
Yes, that approach should have similar results, ie, lower reactance & less dZ/dF. Obviously it also would have a lot less wind load than a solid structure of the same OD.
It could be modeled easily in NEC, but I haven’t done it (so far).