There a quite a few repeaters in Mass using all of the available frequencies, so the reach of your system would be a consideration. I know there is (or at least was) a machine on 625 in Nashua though I've never used it. But to summarize the machines I know of/use in Mass: 550- Quincy (128 belt/south shore coastal areas) and Medford (local) 575- Quincy- Covers to southern NH 600- Kingston (a super machine- covers quite far!) 650- my repeater in Winthrop 625- Boston (moderate coverage), Arlington (decent coverage) 700- Lincoln area, decent coverage 725- Wilmington, probably covers up your way Following to see where you set yours up, because I have a potential plan to set another machine up in Newburyport and as you know the pairs around here are already pretty crowded. Also, the 550 machine is listed here as LIT 55-o and is run by a member here. I can confirm the input tone is different from the output tone. Just reach out to him for access. PS: I'm jealous of your good fortune. The best site I have access to is a 4 story apartment building and it's at or just above sea level with some small hills around.