With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
bsnAPIfRadarSignalLastHeard
bsn AP If Radar Signal Last Heard
1.3.6.1.4.1.14179.2.2.24.1.2
This tells how many seconds ago radar signal was heard on the channel.
Back to AIRESPACE-WIRELESS-MIB MIB page.
IPHost Network monitor allows you to monitor bsnAPIfRadarSignalLastHeard 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.