Hi Warren,
There is no formula for calculating the resonant length of a half sloper.
That's because the tower and everything on the tower is the other half of
the antenna.
It's sorta like trying to calculate leg length of a dipole, when the other
half of the dipole is a random mess of metal of totally unknown impedance.
The tower impedance at the point where the sloper feed is connected could
raise the resonant frequency, lower it, or even make a low SWR impossible
to obtain.
Perhaps they intended for people to cut their antenna far too long, so they
would have some assurance as the wire was trimmed it would eventually hit
resonance.
73 Tom
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