Looks like NBC came up with a fix for this:
http://www.broadcastingcable.com/news/local-tv/nbc-finds-short-term-fix-extend-boston-reach/161743
NBC Finds Short-Term Fix to Extend Boston Reach
The new Boston O&O will be rebroadcast on a digital subchannel owned by a religious broadcaster
Faced with the growing concerns of legislators that Boston viewers will be shut out of NBC programming, Comcast Monday said it has entered a deal with the market’s religious broadcaster that will extend the reach of its
new NBC Boston O&O.
In a letter to Sen. Edward Markey (D-Mass.), Comcast senior executive VP David Cohen said the new station, WBTS, will be rebroadcast on WMPF’s digital channel until the company can buy a second full-powered station in Boston.
Cohen said retransmitting the signal via WMPF, as well as the two transmitters and low-powered station Comcast already purchased, will strengthen WBTS’ signal so much that it will reach 275,000 viewers more than the current NBC affiliate, Sunbeam’s WHDH, does. WBTS is officially launching Jan. 1 on a digital subchannel of WNEU, NBC’s New Hampshire-based Telemundo station.
Cohen said Comcast has already had preliminary discussions with Boston station owners about buying a second full-powered station but can’t further the process until after the broadcast spectrum auction ends.
“In the interim, NBC is taking extraordinary steps to cover the Boston market with three broadcast television stations… which are collectively referred to as ‘NBC Boston,’” he said.
Cohen’s letter to Markey comes a week after the Massachusetts Democrat
wrote Comcast chairman and CEO Brian Roberts, saying he was concerned that NBC’s new station won’t reach viewers without pay-TV subscriptions, particularly seniors and low-income residents. In the time since, fellow Massachusetts Sen. Elizabeth Warren, as well as house members, also pressed Comcast for answers.