[TowerTalk] Adding a second tribander?

[Mike Fatchett W0MU]

Stacking distance on a multiband beam was around 30ft if my memory is 
good.  You are going to have interaction, how much should be modeled.  
Are you planning on rotating the lower antenna?  You could attempt to 
phase them with a stack match or similar device.  When the two antennas 
are 90 degress off the interaction will be the least.

More is better.  Sometime we have to deal with compromises.

I would try to get your tower modeled with NEC and then you can actually 
see how much the 2nd antenna is going to impact the 1st.

W0MU

On 10/29/2024 4:30 AM, Douglas Ruz wrote:
> Hello,
>
> I am new to the list. I am Doug, EA3DZ.
>
> I would like to add a second tribander to a 22m (66ft) self supporting
> tower. I have an Optibeam OB-16-4 on top of the tower.
>
> This tower is a little bit wide, so, probably I will add something like an
> OB-7-3 or similar with 1 meter or more free area in the central part of the
> antenna.
>
> The tower has piramidal shape. It is about 50cm wide in the top section
> (5m) and about 90cm (3ft) in the zone 10m below the OB-16-4.
>
> What is the minimum distance allow between antennas to avoid interaction
> with the top tribander?
>
> Any idea?
>
> Thanks,
>
> Doug, EA3DZ
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