If you are getting WSBK-DT, you should be easily getting most of the other Boston digitals.
WSBK-DT transmits from a common antenna with WBZ-DT, WCVB-DT, and WGBX-DT.
All four use the exact same antenna and are very close in DT channel assignments
(39, 30, 20, 43 respectivley). So I'm curious is something else is causing your lack of reception.
(Front end overload, bad tuner section, local interference... ?)
How about the Providence and nearby stations?
WSBK comes in clearer on analog than any other Boston station. WHDH and WGBH are a close second. Followed by WCVB and then WBZ. WLVI is snowy and WFXT isn't being received on Analog at all. So I could understand if I couldn't get FOX 25's digital signal. That would make sense to me. But seeing that I pick up the Analog on all the other stations, I would expect to be able to receive the digital signal as well.
I get the following digital from Providence. WPRI, WJAR and WEATHER PLUS from them too. I also get WLNE in digital as well as WSBE. I do not get WLWC in digital, nor do I get Channel 69 (ION) in digital either. They just won't come in. I moved the antenna cable around a couple of times and the TV didn't pick up WLNE's digital signal even though I had a clear picture of the analog.
So considering all this data and all of the testing that I did, it just seems to me that my TV does not want to provide a digital picture unless I'm getting a perfect analog signal. This sucks because I was looking forward to getting a crystal clear picture of all the Boston stations that my cable company does not carry. However I'm not giving up yet. I will screw with some more settings later and see if I can make this work.