This idea just occurred to me:
One way to do this might be to put a stacked antenna matchbox up there that
would select "Upper," "Lower" or "Both" antennas and one could drive both
antennas in phase on 15 meters. The 15 would probably need a similar feed
system to the tribander to ensure they are fed in-phase and there might need
to be some re-tuning done on the antennas due to their proximity.
> It is probably not a good idea to have two 15m beams so close together.
> may work if they are pointing in different directions, perhaps that is
> you are trying to achieve. A model will clearly show any interaction. If
> you want more gain, I would just mount a second Skyhawk lower on the tower
> and phase them, which would also improve your signal on 10m and 20m.
> John KK9A
> To: <TOWERTALK@contesting.com>
> Subject: [TowerTalk] interaction between 15mono and tribander
> From: "Felipe J. Hernandez" <email@example.com>
> Date: Fri, 7 Oct 2011 15:53:45 -0400
> List-post: <firstname.lastname@example.org">mailto:email@example.com>
> How bad will it be in terms of interaction between a tribander (skyhawk)
> a ef-515 5 elem monobander
> About 12 feet apart? My concern is that the tribander would mess up the
> monobander on 15.
> CQ test... NP4Z
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