While doing the previous simulation already with HFTA, I did another one
for my own location on a small hilltop, which benefits from slooping
foreground, with the same antennas.
Here the situation is the other way round, generally the 5 element at 100´is
better then the stack at all angles, 20db better at 1-2°, 8db better at 3°
and 5db at 5°. They are almost part from 7 to 17° and then the 5 elements
dominates again by 3 to 7 dbs.
Then I had a look at other pictures of the K5UG site and saw that it is a
hilly location as well.
I think, I must also have a 5-Element at 100´on 40m!!
73
Peter
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Peter Voelpel
I fully agree, he will not improve above his stack of 2x3 elements with the
upper at 150 feet+:
http://us.f13.yahoofs.com/bc/43de01f4ma0718d53/bc/3+over+3+on+40+mtrs+at+K5G
O.jpg?BCk.cEFBL.J7d8wc
If he has the upper at 150´and the lower on 65´his gain at 4° is 5dbs
higher, on 5° 3dbs higher and 2dbs higher up to 14°.
Putting the 5 element at 150´ would gain him about 2dbs above the stack on
the very low angles up to 13° but a null at 26° and would not be that much
flexible on propagation changes.
The 5 elements at 100´has a broader vertical lobe and still a lot of gain up
to 40° (like a dipol) which might be useful for close in contacts but is
worse for DX contests.
I simulated the differences above flat ground.
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