The WBCN interference issue aside, it's surprising to see WKBK using the lower powered of the two translators. 1220 has always had a bit of a daytime advantage in downtown Keene and south of town over 1290. Then again, both should do fine getting into the downtown buildings off the 1220 tower. This sounds like a preemptive step against the possibility of talk moving in on 93.5. 1290 WKBK still misses southern Cheshire county with a solid signal - Winchester, Troy, etc. - even during the day.
103.1 should add something to WZBK 1220's nighttime pattern, which barely covers the town. Keene may be the first local market in the East to have all its many local stations available on FM. That's a far cry from 30 years ago, when WKBK 1220 went off at sunset and WKNE 1290 & the one commercial FM - beautiful music WNBX at 103.7 - signed off at 11:15!