Coverage map shows pretty good coverage in your part of St. L - but I'm surprised at the amount of "weak signal" areas that are shown. It's not like your town has lot of hills like Seattle or SF. IDo you have strongish signal outside your home? If you are stuck w. an Apple phone and can't make use of TM's wifi calling feature until iOS8 comes out in Sept., you might be able to use a signal booster.
The area in Quincy you posted looks like it should have decent service.