Topband: Short Verticals

[David Cole via Topband]

Hi all - 
Assuming a standard 1/4 wave vertical is 36 ohms - is there any formula that 
will calculate the Z if the vertical is short and brought to resonance by top 
loading wires - I understand the Z will be less - but how much by ? I am trying 
to use the formula on ON4UN disc to calculate the approx LC ratios for a 
Lahlum-Lewallen phasing system.
Thanks Dave g3rcq 
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