Richard Clark wrote:
You don't need to worry about velocity factor, or dielectrics when the
basic rationale calls it a stub and it doesn't work as a stub for bare
wire.

Consider a folded dipole made from Wireman #562. The radiating
part of the antenna has a VF of 0.95 and the feedline has a
VF of 0.8. Identical wires with 19% different VFs. How does
EZNEC handle that?
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73, Cecil http://www.w5dxp.com