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It's all typically very expensive because you need a controller for everything. That can be hundreds of thousands of dollars. You need everything to be networked together and to be functioning. And of course it has to be built out. Motorola makes a lot of money building out these systems where they have Motorola type two smart zones and that sort of stuff. But having all these virtual channels saves most municipalities, public agencies, etc. It saves them from having to license tons and tons of channels and it also allows the spectrum to be used more efficiently. So you can put the dog catcher, the fire department, several different police departments, all with their own sub-channels, all on the same system. They can all talk amongst each other but they'll never interfere with each other and they won't hear each other if the radio's in the system is operating properly.