https://www.mnnonline.org/news/radio-remains-best-way-to-share-gospel-in-north-korea/
"Listening to shortwave radio broadcasting, listening to any foreign radio broadcasting is illegal and highly punishable," Foley says.
However, he shares that this doesn't mean radio is obsolete. "Twenty percent of North Koreans are estimated to possess radios where they can listen to shortwave broadcasts."