[TowerTalk] Optimum yagi stacking distance

[David Gilbert]

Hi, Bill.

I didn't state that very well.  I was trying to say that 30 feet SPACING 
was as little as I would use for the tribanders.  I wasn't referring to 
the height.

By the way,  I do have that that sort of terrain ... I live on a 
hillside with a long 18 percent grade sloping downward to the east and 
northeast.  I'm in the process of putting up a 70 foot freestanding 
tower (I got the base secured in the hole today) with an Optibeam  
tribander and a shorty 40.  I would have preferred to get the 40m yagi 
up a bit higher than 82 feet (counting the mast), but HFTA suggested 
that going much higher than about 70 feet feet for the tribander would 
not be so desirable.  70 foot for the tower seemed to be the best 
compromise.

As it is, I'm probably going to fix mount a second antenna (either a 
homebrew 15m yagi or a 2 element SteppIR) even lower on the tower to 
fill in the notch for bands like 15m.

Westward is a different story for me.  The mountain range less than 1.5 
miles to to the west rises up about 2000 feet higher than my QTH, and it 
is amazing how difficult working the Pacific has become for me.  Most of 
the time I might as well wrap a note around a rock and throw it your 
direction.

73 es take care,
Dave   AB7E


Cqtestk4xs at aol.com wrote:
> In a message dated 1/19/2008 5:32:31 P.M. Greenwich Standard Time,  
> xdavid at cis-broadband.com writes:
>
> Personally, I think 30 feet spacing is as low as I would go for  
> tribanders, especially if I had the ability to select  top/bottom/both.
>
> 73,
> Dave AB7E
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> This of course assumes that you are over fairly flat terrain.  I  believe 
> W4AN sat on a bluff in GA and had an antenna at around 10-15 feet which  was a 
> real player.  HFTA shows that at my QTH about 12 feet for a ten meter  antenna 
> was superb.  Of course, not everyone has that kind of terrain, but  it is 
> something to consider.
>  
> Bill K4XS/KH7XS
>
>
>
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