Hi Scott,
Perhaps this is what you are looking for;
power local
Use the power local configuration interface command to configure the access point or bridge radio power level. Use the no form of the command to reset the parameter to defaults. On the 2.4-GHz, 802.11g radio, you can set Orthogonal Frequency Division Multiplexing (OFDM) power levels and Complementary Code Keying (CCK) power levels. CCK modulation is supported by 802.11b and 802.11g devices. OFDM modulation is supported by 802.11g and 802.11a devices.
2.4-GHz Access Point Radio (802.11b)
[no] power local {1 | 5 | 20 | 30 | 50 | 100 | maximum}3
2.4-GHz Access Point Radio (802.11g)
[no] power local cck {1 | 5 | 10 | 20 | 30 | 50 | 100 | maximum}1
[no] power local cck {-1 | 2 | 5 | 8 | 11 | 14 | 15 | 17 | 20 | maximum}4
[no] power local ofdm {1 | 5 | 10 | 20 | 30 | maximum}1
[no] power local ofdm {-1 | 2 | 5 | 8 | 11 | 14 | 17 | maximum}2
5-GHz Access Point Radio (801.11a)
[no] power local {5 | 10 | 20 | 40 | maximum}1
[no] power local { -1 | 2 | 5 | 8 | 11 | 14 | 15 | maximum}2
[no] power local { -1 | 2 | 5 | 8 | 11 | 14 | 15 | 17 | maximum}2
Note The maximum transmit power depends on your regulatory domain and the antenna gain for your access point or bridge. For additional information refer to the "Channels and Antenna Settings" section of the hardware installation guide for your access point or bridge.
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Note The supported transmit power levels differ on the various access points and bridges.
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Note This command requires the radio to be turned on and enabled to determine valid power settings allowed on your access point radio.
From this doc;
http://www.cisco.com/en/US/docs/wireless/access_point/12.2_15_JA/configuration/guide/s15rf.html#wp1017196
Hope this helps!
Rob
