Many thanks to SWLing Post contributors, Doug and Kris, who both share a link to BBC Newshour which was broadcast yesterday (Dec 12, 2021).
The final segment of the show focuses on the birth of international shortwave radio and the first Transatlantic tests. You can listen to this report over the next month via the BBC Sounds website. This is the final piece in Newshour and starts at the 45:05 mark. Very much worth your time!