He has to have something wrong in that stack. K4XS had a good guess.
Assuming flat ground, on 20 meters the only time that monobander should
only be better than the stack is for signals arriving at greater than 20
degrees. (That's after its big null at 17 degrees.) Between 10 and 19
degrees, the stack should absolutely trounce the monobander.
On 15 meters, if he uses all the combinations, the monobander should
only win for signal arriving between 18 and 23 degrees. There aren't
going to be a lot of those signals on 15 meters.
Jim Jarvis wrote:
>Eric Scace, K3NA, presented a paper at Dayton on a stack of
>XA's. It was probably around 1992 or so. It's worth digging
>up, or contacting him directly for info.
>I would not be surprised to see slight advantages of the
>monobanders, but anything more than that, if not explainable
>by height/stacking differences in models, would amaze me.
>Unless something's broken.
>W4XS's comments regarding polarity are probably worth looking
>into...although the notion of climbing to check is unappealing.
>W2UP's comments regarding the XA's mechanical complexity are worth heeding,
>if you don't already know about it.
>Color me..."rebuilt 4 XA's, with all possible colored end caps, and have
>achieved my lifetime quota"!
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