Hmmm... We seem to be talking about a couple of different things here. Let's see if I can clear up what my thoughts are on this.

In the original post, Ai42 was asking about adding 2 yagis to an AP with DUAL antenna ports (WAP11, Belkin F5D6050, etc.) He described it as a "double barreled" design. I took it to mean something like this: (Ascii art time. If this ascii art doesn't make sense, copy this message into notepad or something, and display it in Courier or other fixed-space font.)

(yagi) -------------
|-|-|-|========|(ant port1)|
| AP |
|-|-|-|========|(ant port2)|
-------------

IMHO, that will not work, because of the diversity switch. The diversity switch being the critical part. The switch will see two signals and try to use better one, and get rid of the other. It will either lock one side on, or oscillate between the two. Either way, you don't get both antennae in an additive gain situation. I agree that we're not actually talking about multiphase, it's just that the diversity switch is still in there and functioning on those dual port models.

Tron's first post mentions a phased cable, and Outcast_one mentions stacked yagis. I believe these designs DO work with dual antennae on a SINGLE port. Something like:

------------
|-|-|-|======+=|(ant port)|
| | AP |
|-|-|-|======/ | |
------------

Tron, in your last post, you mentioned a dual antenna repeater. I sure sounded like Bob Cringley's design (www.pbs.org) That would something like:

|-|-|-|===\ (object)
\==|-|-|-|

Some in the WISP community say this won't work, but I think that it will, with some signal loss. On the other hand, just adding two yagis on a DUAL antenna port AP (like the first design and just pointing them in different directions) won't work, for the same reason as I stated above (again IMHO.)

This probably needs some experimentation to completely determine, but in the meantime I'm willing to listen to other thoughts on it. Comments, people?

Cheers,
Thorn