I've lost track of this a bit, so I might be repeating myself.
453.250 CC:05 TG:1111
For the 456/536 my listing is this,
453.250000 LUDLOW POLICE DEPARTMENT Off FM DMR 5 Law Dispatch
If you entered it as a new listing, make sure that you have the Service Type correct.
I haven't been out that way for a couple of years, but as I remember it was working then. It was also confirmed on Scan New England earlier this month.