[DX] Antenna Height for 12 or 15 meters

[John Geiger]

Maybe someone on the reflector has antenna modeling
software and can help me, or maybe they just already
know the answer.

Here is my question.  I have thinking of going to a
monoband yagi for either 12 meter or 15 meters. 
Really like those 2 bands, and yagis aren't too large
for those frequencies.  It would probably be mounted
on a tripod on the roof of the house, which is where
the current antenna is.  This would get it about 25
feet or so above ground, which is over a half
wavelength for both 12 and 15 meters.

It seems to me that 1/2 wavelength is the magic height
to get a yagi to perform.  Is that correct?  How much
better would it perform by going to 40 or 50 feet? 
Would it adequately perform at 25 feet, having a
decent angle of radiation and such?

73s John NE0P


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