Here is some more info for the shoreline area. Most of this is in the database but this is a quick synopsis of what you need to monitor the area. The county PL for 46 mhz fire/ems is 141.3 (there are a few oddities but they only affect the northern departments). The department numbers would be helpful as well otherwise you wont know whos going on the calls. Some dispatchers use them others just say the town name.
46.18 Middlesex County Dispatching
Shoreline area:
45.88 Killingworth/Haddam operations
46.04 Essex operations
46.20 Westbrook operations (crossband repeater 154.445)
46.26 Old Saybrook operations
46.36 Clinton operations
Department Numbers:
3 - Old Saybrook
4 - Westbrook
5 - Deep River
6 - Essex
7 - Chester
8 - Killingworth
9 - Clinton
13 - Haddam