Skainet

Leaving MA and entering VT through I-91 is a fairly large dead zone. I didn't have service for roughly 30 mins. 

I second that. Sprint is spotty at best throughout Vermont and Western NH. Reentering the US from Québec, there's some LTE coverage a few miles away from the border down through Burlington, but past Burlington, I-89 is pretty Sprint LTE-less until you hit White River Junction. I-91 is no bueno, no LTE at all in Keene NH, I didn't hit any LTE signal until Fitzwilliam NH, where I picked up towers in Winchendon MA. 

T-Mobile was better in the rural parts of VT and NH, but Sprint was better in the rural parts of MA. Go figure. 

Franklin U770 USB (band 25 LTE) - $29.99 refurb http://www.ebay.com/itm/381054020878

Novatel MiFi 500 - $79.99 refurb http://www.ebay.com/itm/301393975317