Badger Cab
As Mick noted earlier, there are two frequency pairs. The 152.390 base with 157.650 mobile is the main pair used every day. The other pair is, as I recall, put into use on busy nights when they need a second dispatcher to handle the volume of traffic. They call it "splitting the city" and one frequency handles calls on the east side and the other the west. I'm not sure where the dividing line is. Their office is now on Cottage Grove Rd near the Beltline. I'm sure if you stopped and asked during the day, management would show you the dispatch center.
Badger is a very unique cab company. They are are shared-ride cab, meaing they will pick up multiple riders going in the same general direction. Sort of like a small bus with an unplanned route. It's not uncommon to have four passengers in the cab, each one picked up at a different location and all going to a different destination. And the driver is constantly listening for the dispatcher hoping to fill a seat as soon as someone gets out and they have room for another. It's hard mental work for the drivers and the dispatchers. Listen around bar time in the winter and you'll get a great lesson in the city street geography.