how close do u have to be to here this I live in nj
Depending upon how the system is used, you probably need to be pretty close - but that's not a certainty.
Unlike countywide public safety systems, many business radio systems are designed for smaller footprints - like a complex, building, or facility. On the other hand, some "service provider" systems have larger footprints - like over an entire region/town/county.
I've only driven through the area (I-95) a couple of times and can't remember if I picked UPS frequencies up or not. Hopefully, someone in that area can further advise.