Sh controllers dot11Radio 1 | i Gain

Question

What means each of parameters in an output of command 'sh controllers dot11Radio 1 | i Gain' on Cisco AIR AP1142N-R?
AP1-1#sh controllers dot11Radio 1 | i Gain
Antenna: internal, Gain: Allowed 8, Reported 0, In Use 8
AP1-1#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
AP1-1(config)#int do
AP1-1(config)#int dot11Radio 1
AP1-1(config-if)#ante
AP1-1(config-if)#antenna gain 6
AP1-1(config-if)#end
AP1-1#
AP1-1#sh controllers dot11Radio 1 | i Gain
Antenna: internal, Gain: Allowed 8, Reported 0, Configured 12, In Use 8
AP1-1#
AP1-1#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
AP1-1(config)#int dot11Radio 1
AP1-1(config-if)#no antenna gain 6
AP1-1(config-if)#end
AP1-1#sh controllers dot11Radio 1 | i Gain
Antenna: internal, Gain: Allowed 8, Reported 0, In Use 8
AP1-1#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
AP1-1(config)#int dot11Radio 1
AP1-1(config-if)#antenna gain 6
AP1-1(config-if)#end
AP1-1#sh controllers dot11Radio 1 | i Gain
Antenna: internal, Gain: Allowed 8, Reported 0, In Use 8
AP1-1#

Answer 1

The gain is basically for the antenna used on the access point. An 1142 has built-in antennas so this command will not change anything. On access points that have external antennas, you can change the gain to what the gain of the antenna is rated for. This changes the total EIRP of the AP.
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