The poor Vermont coverage is even mentioned in the NEXRAD wiki page, lol. See below
Coverage gaps[edit]
NEXRAD coverage below 10,000 feet
WSR-88D has coverage gaps below 10,000 feet (or no coverage at all) in many parts of the continental United States, often for terrain or budgetary reasons, or remoteness of the area. Such notable gaps include most of Alaska; several areas of Oregon, including the central and southern coast and much of the area east of the Cascade Mountains; many portions of the Rocky Mountains; Pierre, South Dakota; portions of northern Texas; large portions of the Nebraska panhandle; the Four Corners region; the area around the Northwest Angle in Minnesota; an area near the Connecticut River in Vermont;