Do you own the Wireless Module or are you just trying to monitor it from Orion NPM?
I recently added a poller to grab the AP Names registered to my 4402 Controllers.
Name assigned to this AP. If an AP is not configured its
factory default name will be ap:<last three byte of
MACAddress> eg. ap:af:12:be
It is from the AIRESPACE-WIRELESS-MIB in the bsnAPTable.
There is a lot more information we can pull with UnDP's, but this OID meets some of my basic requirements.