KB stands for Killingly and Brooklyn. From my experience, you'll see two antennas on a KB Ambulance apparatus, both the bus and fly cars, a 33mhz low band whip and a UHF whip.
They can communicate on CLMRN via the QV channels, but they do not have the radios installed in their apparatus. You'll typically find them on 33.80, which, depending on the call, is then simulcast with QV 460 or QV 453. You can monitor QV 453 and QV 460 on UHF and CLMRN.