AIR-LAP1242AG bandwidth issue

Good afternoon,
My name is Dave and my company has assigned me to fix an issue with the signal from a WLAN 5508 Controller to several ( maybe 12) AIR-LAP1242AG's in a warehouse location.
We are currently using a single 5 GHz anntenna but are looking into other options.
The issue we are having is the signal strength.  We are using Windows CE scan guns and the wireless is weak at best (even if you stand directly under the AP.
Since I am brand new to the job, I am unfamiliar with our topology but will do what I can to resolve this issue.  Could the issue be a combination of power, antenna strength and something in the controller perventing the signal from passing?
The ceilings in the warehouse rafters are between 25-30ft.    I will be happy to assist anyone that might be able to point us in the right direction.
I have yet to look into the AP's console but I wanted to get possibly a few ideas.
Thank you so much for your time and consideration in solving our issue.
Sincerely,
Dave P. 

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Thank you so much for your response.  Here are the answers to your questions.
1.  Are the APs installed suspended from the ceiling and the "Cisco" logo pointing to the floor? Yes
2.  Are the 5Ghz antennae being used?  Yes How many per unit?  1 – 2
     Are they connected to the correct radio?  Yes             What type of antennaes? AIR-ANT5135D-R
3.  What are the walls of the warehouses made out of?  Concrete
4.  Are there any electric motors? Just forklifts
5.  Are the APs above or below the level of the shelves? Above
6.  Was a Wireless Site Survey conducted before and after the APs were installed?  No
7.  Is the WLC's Radio Resources Meter set to it's default level? ????  We are not sure of this one yet. 
I hope this helps.
Thank you so much!
-Dave

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    Fa0/46     auto  off           0.0  n/a                  n/a      
    Fa0/47     auto  on            5.8  cisco AIR-LAP1242AG  Class 3  
    Fa0/48     auto  off           0.0  n/a                  n/a     

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              1.22 GB            Inactive RAM
              634 MB             Wired RAM
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