[TowerTalk] Tall verticals

[DavidC]

You specified "tall" towers.  What about a 65 foot Rohn 45
tower with tri-banders at 45 and 70 feet?  Would the side-
mounted beam problem be as pronounced on that?

I want to load it for 80m and want to make some choices
about the type of base I use, where and how I side-mount 
antennas and anything else that may impact performance on 
80m.  I have the tower but the pouring of the base has yet
to be scheduled.

- Thanks! & 73, DavidC  K1YP in Hudson, FL

************************************************************************

> 
> I recommend  against  shunt feeding tall towers
> with side mounted antennas.
> 
> I had a 130 ft R35 tower with a 3L15 on top and 3L20 
> side mounted at 63 ft along with an 80M inverted vee
> at 110 ft.  It worked on 160 but was noticably less
> competitive after I added the side mounted 3L20.
> I believe it altered the current flow in the tower and
> suspect there was a phase reversal in the upper 
> half, partially cancelling the vertically polarized 
> radiation
> 
> de  Tom  N4KG


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