The resonant freq should INCREASE, but by how much is anyone's guess.
However, I, too, have a D40 and found that its resonant freq and BW were
exactly according to specs in the assembly manual. Check the lengths of the
various element components against the manual (paper or on-line) if you have
forgotten them and then verify the resonant freq from the table that's included
with the instructions.
Gene Smar AD3F
-------------- Original message ----------------------
From: "Doug Rehman" <firstname.lastname@example.org>
> I've got a CushCraft D40 rotatable dipole mounted on my tower's mast. At
> present, the tower is laying over horizontally. The D40 is about 6' off the
> It is resonant at about 7035 with about 220 KHz between 2:1 SWR points. When
> I raise the tower to vertical and extend it, thus raising the dipole to
> around 66', should the resonant frequency shift upward or downward? Any idea
> how far?
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