1. 2.4 ghz is on channel 1 and 5ghz is on channel 149.
2. No, but I am not using it heavily yet (we are not fully moved into the house yet)
3. The only device connected to the 2.4ghz radio is an older netbook with a single band Atheros AR9285. The only device connected to 5ghz is a Google Nexus 7 (2013) which uses the dual band Atheros WCN3660.