Okay so then the Radio Traffic I hear on 866.4375 MHz is a talk frequency.
The frequency you listed above is just one of the voice channels for the Peel Region System,
Click on the link, you will see that 866.4375 is one of the frequencies that you will hear communications on.
Peel Region Trunking System, Peel, Ontario - Scanner Frequencies
If you are trying to monitor this system with the scanner you have you will not even come close to hearing what you want to hear. You need to buy a scanner that allows you to listen to trunked systems. You will hear bits and pieces of comms, thats it. Check the frequency list, 866.4375 is just one of many voice channels to monitor. Comms will move from one VC to another that is not being used
Up till the late 90's your scanner would have been fine but not even close now.
And this system is pretty much obsolete, the users are migrating to a new Peel P25 digital and encrypted system.Check out the site and ask questions, if you want to monitor what is left to monitor you need to upgrade your scanner, buy software to control it and to build groups, talkgroups to monitor.