There is an installer section above this forum. If you are unlucky, the next best thing is calling a local TV repair shop to see if they know anyone who would be willing.
In your case, Granite State TV based in Concord might be worth the time to have a chat with.
http://www.granitestatetv.com/
For curiosity sake, post a plot at 75' and 100'. That'll give you the roughest or rough idea if your Boston signal access improves.
Cheers.