Bruce,
You noted:
>The tower site is covered in 60' plus trees and there is a similar
>height hill with similar height trees between my tower and the far end.
>I need to get above the trees plus above the fresnel zone so I want to
>go as high as I can.
I won't try an sort out the mechanics of you project, but I will assure you
trees grow. So what ever antenna you put up will dwarf the tower, most
likely sooner than you think. When I lived in town, my first tower at only
56 foot was taller than the near by trees, eventually the trees got somewhat
taller than the tower. My second tower was at 72 foot and you guessed it,
the tower shrunk the trees did not.
All I am trying to say is if you are trying to get above the trees for a
clear signal and unless you can do an odd lumber jack job, the trees will
win.
In any case, have fun growing towers of any kind is a lot of fun.
Eric - VE3GSI
----- Original Message -----
From: "Bruce Ward"
> Mark,
>
> You make a very sane suggestion.
>
> My reason for putting the tower on top of the building, if I do, is to
> get an extra 8' to 10' of height. The building will be sufficient to
> handle the 1100 pound weight plus the horizontal wind loads.
>
> The tower site is covered in 60' plus trees and there is a similar
> height hill with similar height trees between my tower and the far end.
> I need to get above the trees plus above the fresnel zone so I want to
> go as high as I can.
>
> If I use the Rohn 25G we will add sections until we are high enough.
> This method could mean that I have to build sufficient structure to
> bracket even higher than 35'. I would place the bottom section Rohn 25G
> on the ground (a concrete base) and bracket it to a pole embedded into
> the building.
>
> If I use the the TRI-EX I am stuck with its 70' height plus a 10' mast.
> Since it is a one shot deal I would like to start as high as I can.
>
> Thank you.
>
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