What is the Roku operating frequency

I just switched my Ultra 4800 to WiFi to see if the remote changed bands. Using my WiFi scanner program, I did not see any unknown connection on 5 GHz to match my Ultra's connection. So it appears the remote stayed on 2.4 GHz. Also, it appears to be using a channel other than the nearest WiFi access point, likely to reduce interference. I have two access points near the Roku, one on channel 1 and the other on channel 6. The Roku remote appears to be using channel 11. I have an AP on channel 11, but it's at the other end of the house and is a good 20+ dB lower in signal strength from the two nearer. I removed the batteries from the remote to see if the unknown connection went away, but it did not. So I'm assuming it's scanning the base station, not the remote itself.

The wireless MAC address doesn't match the 4800 though, so perhaps the connection used by the remote is distinct from the data connection. When I do a web search for the MAC address, it comes back unknown, and is apparently some randomized number so as not to conflict with the data connections. 

Media Access Control (MAC) address randomization is a privacy technique whereby mobile devices rotate through random hardware addresses in order to prevent observers from singling out their traffic or physical location from other nearby devices.