Something similar here - it formed the basis of my QST article "What's
the best height for my beam?" in the May 2009 edition.
http://www.karinya.net/g3txq/hexbeam/height_2/
Look in particular at the chart in Section 2 - it shows how relative
performance changes vs height with path and band. Clearly, you can't
talk about an optimum height for a multiband antenna without defining
what you mean by optimum.
A further important consideration is whether a particular height puts a
deep null in the elevation pattern at an angle where you may sometimes
be trying to work. It might be worth sacrificing a dB or two at some
angles in order to avoid a 20dB null at others.
Steve G3TXQ
On 31/07/2013 05:36, K8RI wrote:
Some time ago, there was an article in QST addressing antenna height
Vs distance, band, and band conditions. It showed sarcastically how
often an antenna for a specific band at various heights would be best
for specific distances. It was a very well done study and "I think"
with in the last year or two.
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