Discussion
Which of these antennas would be most affected by a one ohm loss resistance?
Answer: A
The small loop's radiation resistance in that case is around three hundredths of an ohm, so a one ohm loss would leave an efficiency of a few per cent. The dipole at 73 ohms, the folded dipole at 292 and the monopole at 36.5 would all be barely affected. Comparing the loss with the radiation resistance is the whole calculation, and it explains at once why loops and short verticals demand such care in construction while dipoles do not.
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