[TowerTalk] Stacking question

[Grant Saviers]

If the top antenna is at 2 or 3 wavelengths, there isn't much more to be 
gained with height, IMO.  My 2 high modeling put the lower beam a little 
less than 1 wavelength below top and I interlaced the 2 by stacks 20, 15 
and 10m downward,  in my case 5 over 5.   Two high was enough for me 
with all on one tower.  Big guns might use 3 highs and several towers 
like K9CT and K3LR, look at their websites.  There seems general 
agreement that BOP is not useful.

The tradeoff of elements per antenna vs stacking depends on the desired 
results.  For known DX, more is better.  For contesting the far 
footprint gets pretty small for more than 5 elements, but I heard a 
6+6+6 in a QSO on 20m yesterday, top at 170', and tighter than 1 
wavelength spacing to keep the lowest antenna at 80'.

As one contester told me, if you have to move your antennas, you will 
lose, hence several fixed antennas pointed at high mult areas are the 
way to go in contesting.

With all that tower steel, why not go to 200' for 40m real 4 over 4 on 
long booms such as the JKantennas 404 Grande and even more height to get 
1 wavelength up for a 80m 3L if you can stand the hassles? With the 40m 
at 200 and 100' they will be real pile up killers.

Given the likely prop the next few years, 10m is probably not worth the 
effort.  Optimizing now for 80/40/20 makes the most sense to me.  A long 
boom 17m might catch some DX though.  And something for 30m will stand 
out from the crowd.  So, my current design project is for 6L 17m 
interlaced with 2L or 3L 30m on a 48' boom.  Getting close to a design 
that models well.

Grant KZ1W


On 8/8/2016 18:02 PM, john nistico wrote:
> I ordered 4 150 foot towers and am going  to place the antenna order in a few weeks. My question is I have read so much about stacking space 5/8 .64 3/4 1/2 wave. Where do I get the most bang for my buck with mono banders? I am not that advanced to model these on eznec.
>
> NY6DX
>
> John J. Nistico
> 911 Electric Inc.
> 516.325-8993
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