Does Entercom have any grounds to object to this on the basis of possible interference to its Westerly RI property on 103.7?
It's LICENSED to Westerly but WVEI-FM 103.7 is located on top of one of the tallest hills in RI (which ain't saying much) and the
60dBu covers pretty much the entire state; only tiny slivers in the NW and NE corners are not within the protected contour.
However, with translators the protected contour is irrelevant. Any complaints from existing listeners to 103.7 in RI can derail the translator in Boston. They don't even need to be "with standing" (living within the 60dBu contour). Entercom has EVERY reason to challenge this translator, since supposedly 103.7 is a major part of their "south of Boston" listening community. And their main signal, 93.7, is north of Boston and thus has trouble south of the city. Besides, why should they accept any competition in any form?
I would opine that it's a safe bet that Entercom will find some listeners to write in complaints to the FCC within a week of the 103.7 translator firing up. And the translator will have no choice but to shut down and/or change frequency (which it can't really do, AFAIK, b/c there's nowhere to go).