Well everything in the DB is accurate for your trip. A LOT of P25. Logan itself is in Suffolk County, MA., and if you are into Fire Buffing, it's hard to beat Boston fire. You'll be travelling through Essex County, MA., and into Rockingham County, NH. A lot of the area fire is dispatched on "Seacoast Fire" (154.1900 136.5, as I mentioned, in the DB). Portsmouth has their own frequencies. There is very little to no encryption there. Haverhill, which is just over the line from New Hampshire has encrypted police, so you won't hear them. You'll be too far from any of the larger city trunks, such as Manchester or Nashua. You'll be close enough to also hear York County in Maine. Another place to find frequencies is on Scan New England's wiki. (
Scan New England ). York County is also for the most part in the clear. (And in analog, to boot). Rockingham County NH PD is 95% P25. Essex County MA PD is 50/50 between analog and digital.