But Mr. Kapol confines himself to ghosts, a thematic purity admired by his many fans.

“We love Pi Pong,” said Sirichai Suebua, a 37-year-old actor in Thai traditional opera who tunes into the ghost show during the long drives home from his performances. (Pi is the Thai word for older brother, but spoken in a different tone — there are five tones in the language — it can also mean ghost.)

“I only saw a ghost once,” Mr. Sirichai said. “But I can confirm to you that ghosts are real.”

Jessada Denduangboripant, a science professor at Chulalongkorn University in Bangkok who campaigns against what he describes as a reliance on pseudoscience, said he saw little evidence that the love of the supernatural was waning.

“We’ve been told since childhood there are ghosts everywhere,” Mr. Jessada said. “You can have an iPhone and technology all around you. But you still stick to superstition.”

For Mr. Kapol, ghosts have also become a lucrative business.

In addition to his radio show, which has been running for more than two decades under various names, Mr. Kapol owns a ghoulish restaurant, The Shock, where food is served in miniature wooden coffins, and two ghost-themed cafes, also called The Shock. He has directed two horror films and is a regular commenter on television when a ghost expert is needed.

He is also, somewhat improbably, a leading television commenter on European professional soccer leagues.

During his radio broadcasts, he sends his staff to investigate haunted houses and has them call in live reports of what they find. He segues between callers with camp recordings of the sort that might be played in amusement park haunted houses.

“Don’t dare look in the mirror!” an announcer intones with a ghoulish voice during one such segue. “You might find that you are staring at someone else.”