If you’re interested, I can speak to hearing foreign news casts and propaganda on the radio. From the onset of war and on, the British attempted to influence the average German citizens and soldiers through broadcasts both overtly British as well as “black propaganda” pretending to be a German broadcast. One example was Gustav Siegfried Eins (GS1), voiced by Peter Seckelmann, a German POW or refugee who fled (I’ve read one source claiming POW who hated the Nazi regime and another claiming he fled). He pretended to be a Nazi extremist who regularly brought up scandalous affairs of high-ranking Nazi officials (except for Hitler, he made sure not to insult him in an attempt to maintain credibility). Some scandals were true, others were not, but many still caused a stir in Nazi-occupied Europe. A funny anecdote is that the Brits realized they could not run the show forever, so after a few years, they decided to have GS1 “killed off” on air. In the middle of the broadcast, a door slammed open and a machine gun sounded, supposedly the Gestapo finally ending GS1. However, since the show ran twice a day, an unknowing sound engineer played the days’ show twice, meaning listeners heard GS1 die twice in one day!

Another British black propaganda show was Soldatensender Calais. Claiming to be a program set up by German soldiers, the station would broadcast patriotic music, sports scores, lewd jokes, as well as extremely accurate information about the damage of Allied bombing in Germany. Soldiers at the front often found out their home streets had been bombed through this station before they received official word through the mail. Most German citizens and soldiers knew these shows were operated by the British, but they listened to these as well as BBC radio programs because they found they presented either more accurate information or news the German radio wasn’t discussing. Additionally, Soldatensender Calais and similar stations claiming to be German soldiers were broadcast on the frequencies the German military used for its communications, meaning any competent radioman in the German forces could tune in to these shows.

The Germans built radio jammers attempting to block these news reports. RCA in American built a transmitter of 600 kW, but the FCC put a limit of 50 kW on US stations, so RCA gladly sold the transmitter to England. Positioned on the southeast coast of England, German soldiers and civilians from the west coast to the Russian front could listen to British broadcasts.

Sources:

Lande, Nathaniel: Spinning History: Politics and Propaganda in World War II

Johnson, Eric and Reuband, Karl-Heinz: What We Knew: Terror, Mass Murder, and Everyday Life in Nazi Germany