Poppa Stoppa. There are those who argue that there was more than one, but the "real" one (in my opinion) was Clarence Hamann ("...cowabunga! How 'bout that!"). I had the pleasure of working with him at WNNR back in the 70s. A really nice guy.
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As for WRNO...it originally played a mix of things including...Hawaiian music before switching to rock. In it's early days as a rocker, it was Top 40 days and more progressive in the evenings (in competition with WWOM-FM). And, speaking of WWOM, they are usually credited with being "Mother Radio", but they were "The New Groove" and the "Underground" well before that. WWOM used to program country in the mornings, then beautiful music, then rock from 10 p.m. to 2 a.m. (my kind of station). Later, Richard Shanks and the original WWOM "underground" staff shifted over to WJMR-FM where they could, at last, play Jimi Hendrix in stereo.
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WRNO worldwide was groundbreaking; Joe Costello literally re-wrote the rules on shortwave broadcasting, but it never lived up to his expectations financially. Now, sadly, shortwave as a whole is generally forgotten medium, abandoned to Jesus, Spanish language, Spanish language Jesus, and the Chinese (with a few old diehard broadcasters hanging in by the hardest).