As a US listener, I think it helps to have some U.K. Connection/interest (my mother is English). That said, she has never mentioned The Archers or expressed any interest in the fact that I am a current listener! I think it also helps to be interested in podcasts in general (there’s so much out there!) and what non-U.S. voices have to offer. As monolingual Americans, the BBC is a good place to look for alternative programming that we can understand and the BBC has done a great job of making a lot of radio programming available via podcast.