I dont know if you would be able to pick that up as i dont live rather close to Cedarhurst and im not able to receive that very well however taxi companies dont always use the most efficient radio systems
Are you using a indoor or outdoor antenna?
If you want try and take note of what streets/areas they seem to be dispatching to that would help pinpoint where this is coming from
You can search the FCC database for a licensee on that frequency quire easily. The db here on RR is pretty useful and it's updated once a week so it's highly accurate.