[TowerTalk] Change in resonant freq. near ground?

[RLVZ at aol.com]

Hi Guys,

I've got an Cushcraft XM-240 (shorty-forty) attached to a fold-over tower 
with the tower folded over.  The XM-240's reflector is only 18" off the ground 
and the driven element is pointing straight up in the air and about 23' above 
ground level.

Question: I realize the resonant freq. at this low height will be WAY off and 
I don't plan to tune it at this height- but I'd like to check it and see if 
it is resonant at any freq. with a MFJ-259 before I raise the tower.  (perhaps 
it would tell me if I have a serious problem or not)  The question is: would 
you expect the resonant freq. at this low height to be higher or lower than 
that when the antenna gets 90' in the air?

Thanks & 73,
Dick- K9OM   


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