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Mysterious ‘Iranian radio message’ turns out to originate from American military base in Germany
“Attention! Six, four, zero”: mysterious radio messages in Persian have been causing fear since the start of the war in Iran, because it was feared that they were coming from Iran and were intended to activate sleeper terror cells. Now it turns out that we need to look for the origin much closer to home.
Hans Renier
Journalist at HLN
2 April 2026, 16:29
Last update: 17:07
Since 28 February, shortly after the US and Israeli attack on Iran began, an unknown source has been broadcasting mysterious radio messages. Several times a day, a voice can be heard reading out sequences of numbers in Persian, in groups of five.
These ominous messages caused great unrest. It was feared that the signals were coming from Iran to activate sleeper terror cells worldwide. US President Donald Trump also confirmed that “the US has intelligence about Iranian sleeper cells”:
Trump: “We have intelligence about Iranian sleeper cells”
The ‘Priyom’ group, an international network of amateur radio enthusiasts, has managed to trace the signal. Their remarkable discovery: the secret transmitter is not located in the Middle East at all, but in a wooded area southwest of Stuttgart. And that happens to be right next to an American military base. This is reported by, among others, ‘Der Spiegel’ and the German news magazine ‘Focus’.
Cold War technology
Broadcasting sequences of numbers via shortwave is a spying technique from the Cold War. With ‘numbers stations’, governments can send coded instructions to their infiltrators in an untraceable and secure way.
When the location of the transmitting mast threatened to become known, the radio signal suddenly fell silent.
A former American intelligence officer told the ‘Financial Times’ that everything indicates “that the signals are an emergency measure, presumably from a Western country, to maintain contact with agents in Iran.” So the messages may serve to direct American spies in Iran.
Caught by hobbyists
The Americans now appear to have been caught by a group of hobbyists. As soon as the location of the transmitting mast threatened to become public, the radio suddenly fell silent on 25 March. In the meantime it is back on air, but the signal is weaker, making the content of the messages almost impossible to understand.
The press service of the US armed forces does not wish to comment for the time being. The German telecommunications regulator states that “no illegal activities could be established”.
Posted by J883