Antenna Selection for High ceiling (Warehouse)

i read nearly 500 topic on antenna selection for high ceiling and industrial warehouse environments (~10m ceiling)
Question1 : both ant2544v4 and Ant2524 has ~60 degrees Elevation plane 3 dB beamwidth does it mean this Omni antenna could be mounted on 10m height without coverage issue ?
Question2:suppose installing plenty of 2702 with Ant2524 or Ant2544V4 in close adjacency , does CleanAir2 helps to avoid interference ?
Question3:if i want avoid directional antennas to cover aisles using dipoles is the last solution ? (if omni antenna cant afford enough elevation due to its nature )
my warehouse area is something like this : http://www.pathguide.com/Images/Content/warehouse%20aisle.jpg
thanks

As I can see this location presents challenging RF conditions: high attenuations, reflections, multipath, etc. The fact that you need to implement Voice WLAN too, introduces more difficulties.
You have to conduct a wireless site survey. I don't know how much experience do you have with this activity or if you have the equipment and site survey tools required, but it has to be done.
In the worst case scenario you have to grab at least one or two APs from the model that you intend to install, set them up in stand alone mode with some test SSIDs and install them in the warehouse in different locations. Than you walk arround and try to measure the signal quality and attenuations. You cand use some free or trial site survey applications that can be found on the Internet.
You have to find out what protocol (802.11 a/b/g/n) the barcode scanners are using and what TX power are they capable of. You should set up your APs accordingly (the AP TX power should not exceed the client power, preferably it should be about half in order to benefit of CHD). The same has to be done for the Voice clients. The survey has to be done separately for each 802.11 protocol. I recommend taht you do some futher reading on the subject.
As for the antenna type, Cisco recommends directional antennas in high ceiling environments. However, I have installed 2702e APs with standard omni antennas in warehouses and they did the job very well. The difference in my case was that I installed the APs on cable channels at ~6-7 meters, not directly on the ceiling. Maybe you can find some other mounting possibilities besides the ceiling if you want to stick to omni antennas.
The co-channel interference between adjacent APs is avoided usualy by DCA and TPC not as much by CleanAir. However in 2.4 GHz there could be some interferences.
As a conclution you have to use some real APs in order to estimate, with at least a minimal accuracy, the position and number of required APs for the deployment. Do not forget about the cabling requirements for the APs, distances to the closest switch, electrical power etc.

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1.1 Frequency                             2.4GHz ~ 2.5GHz ;4.9GHz~5.825GHz
1.2Impedance……………………50 Nominal
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1.4 Return Loss……………………-10 dB Max.
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1.8 Admitted Power………………1W
1.9 Cable……………………………RG-178 Coaxial Cable
1.10 Connector…...…………………SMA Plug Reverse
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2.1 Antenna Body……………. ……TPE
2.2 Antenna Base……………. ……PC
2.3 Antenna Base……………. ……PBT
2.4 Operating Temp. ………………-10 ~ +60
2.5 Storage Temp. …………………-10 ~ +70
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Antenna Selection for High ceiling (Warehouse)

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