You can use Cisco tools like Prime INfra(Its depend on ur budget).
There is one tools that you can start with The Dude from Mikrotik. This tool is made to monitor Wireless netwroks via probes, SNMP, etc. You can draw maps per location and track BW usage on each AP interface. Thsi tool helpes a lot and it is quite easy to set it up. It works better on XP or 2003.
Beside this tool, there are several tools described in how-to from Muhammad Bilal
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