During the days of Linksys hacking, I connected a 15db omni to my Linksys AP. I thought it would crank. Instead, I had better reception
with the internal antennas.
I think you see the dilema. More gain = narrower pattern = pattern stability problems. The problem is you need as much gain as possible for the receive side. You can compensate for low gain on the transmit side by cranking up the power, but there is nothing you can do for the receive end.
Now comes the directional antenna
. Even better, they put the whole radio
in a weatherproof box along with the panel antenna
and gave it power over the ethernet cable.
These (I am partial to Ubiquiti, but have used Engenius also) radios had great receivers, 30 degree Vertical and 60 degree Horizontal patterns, and put out close to a watt.
But, with a directional antenna, you need to keep it pointed at the hotspot. That is why I made my rotator. It has worked like a champ since 2008. The recent posts have been helpful for me determining whether it is worthwhile putting it up the mast
since my new design now has unrestricted rotation.
I didn't have luck with omnis and except for that they are "Easy", I don't see any place for them in "Long Range Wifi".