Wireless Antenna Selection question

Hi guys,
We recently installed (12) 3702e's with 2524 dipole antenna's in a 100,000 sq ft warehouse. AP's run off of a 5508 controller and are Lightweight.
Key things to consider: These AP's are mounted about 32 feet in the air on the ceiling. We need the signal to reach the floor and cover a fairly wide range. That said, we have racks that reach up to about 5 feet from the ceilng and contain pallets with boxes on them.
We have folks with scanners on the ground that will be using the wireless. Do these antenna's sound like they are the proper type of antenna being the AP's are 32 ft from the floor and need the signal to reach the floor?
Reason I ask, We are seeing our Cisco Wireless controller reduce the TX power levels on the AP's to 7 or 8. I believe the power levels are dropping because the AP's are within a couple hundred feet of each other and have nearly direct line of site. My theory is that they reduce power based of of that to prevent co-channel interference. The issue is, if we spread them out more to get higher TX levels, we potentially lose Horizontal distance on the floor.
Is my thinking correct? Should we be using a different type of Antenna? See attached map to get a glimpse of what we look like.

Please check the below link for wifi antenna selection guide:
http://www.intermec.com/public-files/product-profiles/en/CiscoAntennasAccessories_spec_web.pdf

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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 ?
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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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Here is the URL for the Antennas and Accessories it may help you for the Antenna selection
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What's the purpose for the two Wireless Antennas on a WAP?

I have a very simple question, that I'm a little confused about. Here it goes.
Most Access Points have two antennas. One is labeled as LEFT/PRIMARY and the other is RIGHT.
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Hi Rashida,
The use of two Antennas on these AP's is used for "Diversity Mode. In many cases, 1 single Antenna will work nicely. Here is an explanation for the use of two Antennas :)
This describes the use of 2 **Identical Antennas in "Diversity" Mode;
The purpose of diversity is to overcome multipath reflections. Diversity antennas that share the same physical housing are placed at an optimum distance apart. The maker of the particular antenna determines that distance based on the characteristics of the antenna. When you use a pair of antennas with matching characteristics to provide diversity for cell coverage in your facility, the guideline is to put those matched antennas at a distance apart from each other that is equal to a multiple of the wavelength of the frequency that is being transmitted. The 2.4 GHz wavelength is approximately 4.92 inches. Therefore, to support diversity on a 2.4 GHz radio with two separate antennas, the antennas should be spaced approximately 5 inches apart. The antenna pair could also be spaced at multiples of 5 inches, but the distance between should not exceed 4 multiples: reflected waves farther apart than that are likely to be so distorted and different in delay spread that the radio could not work with them.Because each antenna is selected by itself, both antennas must have the same radiation characteristics and be positioned to provide similar cell coverage.
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Multipath and Diversity
http://www.cisco.com/en/US/tech/tk722/tk809/technologies_tech_note09186a008019f646.shtml
A diversity antenna system can be compared to a switch that selects one antenna or another, never both at the same time. The radio in receive mode will continually switch between antennas listening for a valid radio packet. After the beginning sync of a valid packet is heard, the radio will evaluate the sync signal of the packet on one antenna, then switch to the other antenna and evaluate. Then the radio will select the best antenna and use only that antenna for the remaining portion of that packet.
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Diversity Antenna Systems
Diversity antenna systems are used to overcome a phenomenon known as multipath distortion of multipath fading. It uses two **identical antennas, located a small distance apart, to provide coverage to the same physical area.
From this Antenna reference guide;
http://www.cisco.com/en/US/products/hw/wireless/ps469/products_data_sheet09186a008008883b.html
Hope this helps!
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Wireless Antenna Selection question

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