I think what you were trying was an old analogue system... May not be in use anymore...
Like I said, the one I found is all digital... They may have transitioned, that I couldn't tell you...
If you loaded what I suggested, go back to the link I posted... You will see two sites listed for Middlesex County...
Those are the sites I would leave and delete the rest for now... See how it works for you...
Then you can clean up your list to your liking... As in deleting systems your not interested in...
This the old system for the MARCS IP that I used to listen to... It's been depreciated...
Ohio MARCS - Multi-Agency Radio Communications Trunking System Profile
www.radioreference.com