All I really recall is a man broadcasting on radio equipment after some form of apocalypse. The man was white and probably middle aged and the movie did not seem like a big budget production. I think it was mostly just the man in his safe place talking on the radio (there may have been flashback scenes and he may have been telling the story of how the world went to hell).
Something had happened to most of the population - I think it was some kind of alien hive mind taking them over or something in that general vein.
It was a live action movie in English, and I watched it within the last few years fairly certain its a relatively recent movie (within the decade at least) and it was in color.