With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cd11IfNativeTxPowerSupportEntry
Cisco DOT11 Interfaces Native Tx Power Support Entry
1.3.6.1.4.1.9.9.272.1.1.2.16.1
Each entry specifies a supported transmit power level for a frequency band, with a specified modulation technique, on the IEEE 802.11 radio interface.
Back to CISCO-DOT11-IF-MIB MIB page.
IPHost Network monitor allows you to monitor cd11IfNativeTxPowerSupportEntry on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.