If they are using the radios most likely a expired license....OR could be on a VHF Repeater service where they dont need a license...OR what was said above....stuff left in trucks using smellular....
152.9825/D311 is used by Berkshire County Fire. (Licensed to Pittsfield Communications)
Isn't that antenna on the other building (the one just south of the Gilmore Building) up there on Gas House LN? The only licensee within 0.2 KM of that area is Kimball Fuels (151.580 D311)
John B Hull Fuels, which is just east of there, uses low band, but their transmitter is located up near the Water Tank on private property off of Pleasant View Drive.