I'm going to use ANT5959 and AIR-1242AG access point while deploying wireless network at the customers warehouse. I've chosen diversity antenna because of lots of metal constructions in the warehouse. However, during the first site survey I've noticed that ANT5959 with its 2 dBi is not enough for some big rooms, so I've found ANT3213 antenna with 5 dBi at cisco.com, I have no such antenna just now that's why I have some questions:
1. How ANT3213 is mounted (if it is mounted on a pillar then how it can give an omni coverage)? Can I mount this antenna on ceiling?
2. Why ANT3213 is cheaper that ANT5959 despite it has more dBi?