Rebellion is an Irish drama currently airing on Netflix:
"Rebellion is a five part serial drama about the birth of modern Ireland. The story is told from the perspectives of a group of fictional characters who live through the political events of the 1916 Easter Rising."
The 3rd episode of Season 1 has a scene of a spark gap transmitter in operation, sending a message about the status of the rebellion.
Subscribers can see it here, two minutes into the episode.