Our Sr Maria Ruth has been the voice of Radio Paulinas for 25+ years. Here's a great article about her programs. According to the piece, she is one of the biggest producers in Spanish radio, with shows on over 100 stations worldwide.
We used to have a weekly program on one of the Spanish radio stations here in Chicago, but we got priced totally out of even the Sunday morning slots some time in the '90s when advertisers realized that Hispanics were a huge market... Anyway, be sure to read the article: it taught me a few things about our radio apostolate that I didn't even know after living in community with Sr Maria Ruth for years!
A few years ago I did a video of Sr Ruth telling her vocation story: