A strange buzzing signal has been repeating endlessly on the frequency of 4625 kHz since the mid-1970s In 2025, the Buzzer’s activity spiked dramatically, including transmissions during a phone call between Russian President Vladimir Putin and US President Donald Trump in February MOSCOW  Since the mid-1970s, radio enthusiasts have been captivated and mystified by a strange, buzzing signal repeating endlessly on the frequency of 4625 kHz. It has no official name, no known operator, and no

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