[TowerTalk] LPDA optimal height

[Ed]

This is why people stack antennas. There is no ONE sweet spot. 100' is almost too high for 10m but perfect for 30m. I say put it up, if you already have the tower. 

I'm planning my own installation. I have three crank up towers:  106', 89', and 70'. The Steppir DB-36, which has three ele on 40m (6-40m) will go on the 106', a smaller Steppir on the 89' and a dedicated 6/10m antenna on 70'. I figure this will give me good, all around coverage. 

I can also vary the height on towers, if I'm aiming at any specific target. 

Crank up is the way to go, unless you have stacked antennas. 

Good luck.

Ed NI6S
> On Feb 14, 2017, at 03:06, Jeff AC0C <keepwalking188 at ac0c.com> wrote:
> 
> I’m considering putting up an LPDA this summer to augment the existing stuff.  The LPDA would serve two purposes:
> 
> 1. 30m/17m/12m DX chasing.   I suppose that really means 30/17 as I can’t remember the last really solid 12m opening...
> 
> 2. Fixed-on-SA for 20/15/10m when contesting.
> 
> The problem is the usual tools for helping on height (HFTA) are more or less band specific so what is the best height on (for example 20m into SA) is not really a great height for another equally important (e.g. 30m DX into eastern side of EU).   In playing around with HFTA clearly each height seems to provide some benefit over another.  Higher band and higher height gives more nulls but better low angle performance.  
> 
> I figured that something around 80-100’ overall but would greatly appreciate any suggestions...
> 
> 73/jeff/ac0c
> www.ac0c.com
> alpha-charlie-zero-charlie
> 
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