This is not surprising. We’ve been using AM and FM radios to debug circuits for decades. They can pick up oscillations and instabilities.
But the range is centimetres at best. So much so the antenna gets used as a fairly directional probe.
But the range is centimetres at best. So much so the antenna gets used as a fairly directional probe.
Really why is this a surprise when you can hear the phone blips and buzzes from the RF induced pickup on shitty hifi equipment.