I was just trying to hear the Voice of Nigeria's English broadcast on
15120 khz. It seemed to be audible, as I heard accented English being
spoken. However, a stronger broadcast in another language was stepping
all over it. I can't identify the other language with confidence,
although it sounded European (maybe Portuguese?). I checked the EiBi
listing, but didn't see anything listed that seemed to 'fit' what I was
hearing.

Any idea what this stronger signal is?

Steve