I can't agree more with your thoughts about radio. For me, I found that TV lets you slip in a passive mode where learning isn't optimized. When you're listening

I can't agree more with your thoughts about radio. For me, I found that TV lets you slip in a passive mode where learning isn't optimized. When you're listening to a radio broadcasts, you're forced to concentrate on how the words sound and what they mean in order to follow along, for listening comprehension and building up vocab, listening to the radio is the method that has worked by far the best for me. It usually takes a couple of minutes before anyone recognizes that I'm not a native speaker, even in the languages I learned after my early 20s, and I think learning by radio as opposed to texts or the usual classroom-ish stuff had a huge part in giving me "native speaker" pronuncation (which incidently is almost always quite different than "correct" pronuncation).