I heard the Spanish-language station on 1110 kHz again last night, loud and clear in Andover until at least 11 PM. This time I stayed awake to hear the ID. It was WMVX in Salem NH.
Could they be testing use of the WNNW tower close to me, because I don't really get a good signal from WMVX in the daytime. They use 4-towers to send the signal to the northwest (they have to avoid the Providence station on 1110). Which means they don't deliver a particularly good signal to the Hispanic population in the Merrimack Valley.