It used to be that radios were made of hardware (electronics only), had antennas that were tuned to pick up on a select few frequencies and transmitted in all direction (omni-directional). Tuning to another set of frequencies required another radio/antenna combo. Today, the radios are "software defined" (they auto-detect what frequencies are present in a geographical area and load the appropriate software to work with them), the antenna technology is advanced to the point that one antenna can transmit on a wide variety of frequencies and the signal is transmitted by the antenna from one point to another rather than in all directions. So what this means is the antenna can be aimed at a house, the radio will pick up what frequencies are present, auto tune to those frequencies, and then start picking up communications, mapping out the locations of structures in the house (walls, furniture, etc).
You can try this and see if it works - move through your place and move all the furniture around an inch or two and you'll likely see what I mean. It will discombobulate the system for a short while. You'll likely notice the regular schedule is thrown off and people you don't usually see will show up at your next door neighbors, etc.
I think it's public safety/community policing/problem orientated policing
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