Richard Fry wrote:
A helically-wound dipole or monopole that is physically short in terms
of a free-space wavelength can be made electrically resonant at its
input terminals as a result of the inductance of the helical form of
the radiating conductor.

But that does not mean that it has all of the electrical
characteristics of a linear conductor that is inherently resonant,
without the need for inductive loading.

The radiation resistance of such a helically-wound radiator can be
much lower than a naturally resonant radiator, which can mean that the
percentage of transmitter power radiated by the antenna SYSTEM can be
much lower than when a naturally resonant radiator is used.
. . .

But a helically-wound radiator *is* a naturally resonant radiator if
wound to make it so. It just isn't straight.

Roy Lewallen, W7EL