In order to improve my English listening/understanding ability, I listen several different documentaries at least 5 minutes per day. These documentaries are generally produced by BBC. They are in British English accent as you know. Is this a good selection? I mean that should I listen which one, American or British English accent? Which person (having English or American accent) can easier understand other accent (American or English accent).
By the way, I open any other suggestion about listening because I saw that it is very useful for my language improvement in all dimensions.