A long time ago there was a arguement both on this group and on E ham
with respect to the function of a coil with respect to replacing
missing degrees of a wavelength.
Both Tom W8ji and Roy W7EL did experiments which apparently justified
an account written up by Tom under the subject.
You should look it up and read it.
Tom states that the double helix is totally resistive and antenna
elements should be straight reffering to spacial distance.,
He then came to the astonishing conclusion that for maximum efficiency
radiators should be straight and for some reason dismissed the double
helix to give strength to his claim that radiators must be straight
which is fraudulent. A straight radiator generates a external magnetic
field which introduces losses whereas the double helix supplies all
applied current to the generation of radiation. None of the experts on
either group challenged challenged the statement allegedly supported
by both Tom and Roy
and it still remains in print to this day
Art