With a few exceptions (Pittsfield, Great Barrington, Dalton/Hinsdale, North Adams and Williamstown), everyone is dispatched by the sheriff’s office. Look at the top of the Berkshire County page for the frequencies, or under Berkshire County here:
Scan New England is an excellent reference source, in the New England area it can be more up to date than RR and often has updates and changes sooner. www.scan-ne.net You need Berkshire and Hampshire Counties in Mass. Frequency data is in the WIKI section.