@ryanc All of the images of access points in that guide have the antennas parallel to each other. Those dipole antennas radiate in a roughly doughnut shape, with weaker signal in the cone shaped volumes of space extending above and below the ends of the vertically aligned antennas. There are two antennas, and they can be positioned, so that they can be angled at 90 degrees to each other, so the dead zones of each is covered by the signal of the other.

I ended up learning /way/ to much about antennas when I got into flying FPV quadcopters: