Actually, I always wondered how 106.7 was allowed to sign on in the Portland market in the first place, considering WMJX Boston runs full power on 106.7. Where I am in New Hampshire, I used to get a decent signal from WMJX most nights till the North Windham ME station signed on.
I used to live in Casco, Me...about 10 miles NORTH of North Windham, in the early 1980s, and with my yagii style rooftop FM antenna, which I actually installed so that I could listen to WBCN, I never had any difficulty receiving WMJX/WBZ-FM 106.7. In fact, I frequently could pull in what was WBZ-FM 106.7 on my car radio when driving in North Windham...and I understand that was before the signal was some what upgraded!!!!