Discussion
What is a helical antenna operating in normal mode equivalent to?
Answer: D
When the helix diameter and pitch are small compared with the wavelength, it radiates broadside like a short dipole, the coiling being simply a way of fitting more conductor into a short space. The axial mode, which needs a circumference near one wavelength, is the circularly polarised end fire case and is a quite different animal. The rubber whip on a handheld radio is a normal mode helix, and its performance is simply that of a short and heavily loaded vertical.
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