Gerry Burke, in a report on NEC-3I (which models insulated wires), makes
the comment that a variety of techniques provide accurate and consistent
results for wires near resonance (he gives an example where the bare wire
is resonant at 0.47wavelength, and the insulated wire is
0.42wavelength). He further comments that the differences increase a lot
near antiresonance.
The take-home interpretation of this is that if you are modeling things
like dipoles at twice their resonant frequency (e.g. in a multiband fan
dipole), one should watch out.
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