I'll second this, at least as of a few years ago. I used to regularly take the Amtrak train into Boston's South Station. The area near Mansfield, MA. had basica

I'll second this, at least as of a few years ago. I used to regularly take the Amtrak train into Boston's South Station. The area near Mansfield, MA. had basically no signal, despite being in a suburb. Not sure if that's improved since then.