Alright, so I was curious about this one too. I picked up 'The Radio Man' thinking it might be one of those dramatized historical accounts. But no, it's pure pulp science fiction. It's by Ralph Milne Farley—that's a pseudonym, by the way, for Roger Sherman Hoar, who was a state senator and professor. Written back in 1924, it's a classic planetary romance where a guy gets his mind transmitted to an ant-like alien world. The whole 'based on a true story' vibe probably comes from the 'radio' tech being a big deal back then, so it felt cutting-edge and plausible to readers of the era.
I think sometimes the very old-school, earnest style of these early sci-fi stories can trick you into thinking they're recounting something real. They lay out the sciencey bits with such conviction. But it's definitely fiction, a product of its time, imagining communication tech that was just starting to blow people's minds. It's a neat little time capsule of speculative thought.