[TowerTalk] Will Resonance Go Up or Down?

[doc]

Is it fair to generalize that proximate objects
will almost always detune an antenna to a higher
frequency?

Or are there standard rules of thumb which help
to ID when that is expected or not?

doc

> I would expect it to go up in frequency.
> 
> David Robbins K1TTT
 >>
>> 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
>> ground.
>>
>> 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?
>>
>> Tnx,
>> Doug
>> K4DDR


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Thanks! & 73, doc kd4e


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