On Mar 24, 11:57*am, "Richard Fry" wrote:
Radiation resistance is a function of the end-end length of the helix and
the frequency, whether the helix is self-resonant or not.

Yes, I thought that was the purpose of your posting. As Kraus said,
the helical has an advantage over a short straight conductor - same
radiation resistance with less reactance. The radiation resistance of
a 6" long Texas Bugcatcher coil is approximately the same as a 6"
piece of wire.
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73, Cecil, w5dxp.com