At this point, check out 154.190 and 155.820 MHz. 154.190 has been used for dispatch and operations for both Alburgh and Isle La Motte. I believe there is (or was) a plan to place more repeaters throughout the county on 154.190 for the lower three towns, but there has also been monitoring reports of Grand Isle County units talking to St. Albans Central Dispatch on 155.820 MHz. The county had also been trying to get a new dispatch / paging channel for the entire county but the license kept getting rejected by Canada, so that plan may have gone by the wayside.
I may try to make a fall trip up north to see what's going on.
Kevin