An object is used to describing the bandwidth that the AP support .You can config the AP bandwidth by the hwRadioMngChannelBandwidth,
but the AP may be not working on value of the your config bandwidth. you can get the actual bandwidth by hwRadioWorkingChannelBandwidth.
At present, 802.11n AP supports three kinds of bandwidth listed in the enum, and 802.11a/b/g AP just only supports HT20(1).