Domestic Airspace accepting handoffs from Canadian airspace (Moncton Center) are:
KAUG...this is Boston Center sector 2 134.95 but due to antenna placement of this feed, air side to the east can't normally be heard.
KHUL...this is ZBW sector 1 128.05- often these two are combined...and the ground side can't always be heard on HUL since ATC has several transmitters in Maine and they switch them around daily based on aircraft track and controller pref.
The next sector to the south is ZBW 133.45 which is carried by KHYA.-Cape cod. Currently it's faint but can hear it.
Further South is ZNY sector 125.92/133.5 which tends to get more aircraft headed to southern cities in Eastern us...although PHL and JFK arrivals will sometimes come in from Moncton here too. This can be heard on the WRI feed.
To the West...esp in winter, ZBW MPV sector 118.82 gets handoffs from Montreal center as they cross into northern NE.
unfortunately there are almost no Canadian centers at high level more northeast hearing the VHF comms as they make landfall over Canada/Gander center or even Moncton. We had a few feeds over the years but they are gone. Most of the Canadian feeds catching centers are low sectors and you won't hear the guys coming in from the NAT tracks.
Once you have a flight/track you are listening to, follow the handoffs...most ZBW sectors are on Live ATC now thanks to Dave and supporters...as you go further inland, it's spotty.
Since the traffic varies daily...take a look at flightaware.com and you can see where all the traffic is on a particular day.
Hope this helps