When conducting joint operations w/NHSP, they will use 155.4750/136.5 (aka LP-2) and patch it w/the appropriate talkgroup. On rare occasion, they've tied into 156.0900/136.5 (aka LP-South).
Plans had been discussed to add a VHF channel permanently to their Channel-1. Don't know where they are with that.
Have they switch to EDACS ProVoice? I haven't noticed any activity all week on any channels. I live in Merrimack, NH. and got them loud and clear until about a week ago.