"Reg Edwards" wrote in message
...

Imagine a rod with 60 degree notches cut out of it
such that the RF path is twice as long as is the rod.
VF = 0.5? 1/4WL vertical = 117/F? 75m vertical = 31ft?

Yes Cecil, I am imagining. Now what ?

Reg, a very efficient 31 ft. resonant 75m vertical
would be a good thing, right?
--
73, Cecil, W5DXP

==============================
Cec, now I can see what you're getting at.

Firstly, wrong - the difference between a very efficient antenna and
a very efficient antenna is absolutely negligible and not worth the
extra labor involved.

Secondly, the expected 4-fold increase in loading inductance to tune
the antenna to one half of the original resonant frequency, as a
result of cutting threads or slots in the fat antenna rod, does not
and cannot occur.

But you win first prize for ingenuity. ;o)
----
Reg, G4FGQ


At frequencies such that the groove spacing is a half wavelength one might
see resonance effects.
Imagine a stack of discones.
Probably just another worthless academic curiosity.
And it's THEORY!

73, H. NQ5H