When I left Motorola just under a year ago, we had put several conventional MotoTrbo repeaters into service in the Virginia Beach, VA area. At that time, the TRUNKING option was not available yet. Having said that, I don't think the trunking is available yet, but I might be wrong. I haven't really kept up with the latest now that my current job requires me to maintain a conventional EDACS trunking system. Not that I am not still Moto at heart
As for conventional receive, in theory you can buy a VHF or UHF MotoTrbo radio and program it for what you would like to monitor. One of the new concepts with Motorola digital has to do with TDMA slots. MotorTrbo can have two concurrently running conversations on a single RF channel. A common setup using this was voice on slot 0 and data on slot 1. As for programming, you need to select the correct slot to hear traffic. If you did'nt know, you could set up two channels, one for slot 0 and the other for slot 1 and then just scan between the two to find the voice traffic.
I am trying to remember, but I THINK there was some kind of equivelent to a NAC used, but I forget what the term was. Just think of it as a digital DPL.