Discussion
What is the main effect of conductor loss on a half wave dipole?
Answer: D
With 73 ohms of radiation resistance against a fraction of an ohm of copper loss, a half wave dipole is essentially a hundred per cent efficient, which is why it is such a good reference antenna. The picture is entirely different for a short dipole or a small loop, where the two resistances become comparable. Beamwidth and resonance are unaffected by a small series resistance. Where the loss sits relative to the radiation resistance is the question to ask of any antenna.
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