With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cwrRx2RfIndex
Cisco Wireless Rx2 Rf Index
1.3.6.1.4.1.9.9.136.1.3.1.1.7
This object specifies the index of the second receive antenna in the cwrRfTable. This index will be 0 if the associated receive antenna is not present.
Back to CISCO-WIRELESS-IF-MIB MIB page.
IPHost Network monitor allows you to monitor cwrRx2RfIndex on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.