<rant>
I am seeing so many wireless APs mounted vertically on walls instead of horizontally on ceilings or beams.
These wireless installations are normally at schools, churches or halls, and are usually Ubiquiti devices. Now I have nothing against Ubiquiti as a wireless device, and in fact I use them myself, mainly for backhaul or mesh solutions. Ubiquiti is the vendor of choice for a lot of smaller installations, and the provider is usually "Joe's Electrical", the small business that does some electrical wiring, some data cabling, and small wireless installs. These installers understand the "omni" aerial as providing a bubble of coverage around the AP, and that seems to suit locations that we are talking about. These installs probably work as well, giving coverage in the hall or wherever, and the customer is happy. It just triggers my sense of "rightness", knowing that half of the signal from these APs is being wasted through the ceiling or roof, and a much better coverage and throughput could be given to the customer if the AP was only mounted the way it was designed to be.
</rant>