blinry ☎️254625 & 26: See ionosondes and radar signals
In the low frequencies, occasionally, you can hear a short *chirp*! :D These are caused by ionosondes, scientific instruments which measure the properties of the ionosphere by sweeping a wide frequency spectrum.
Another signal (which I accidentally got in the same screenshot) is a radar system – in this case, according to the Signal Identification Wiki, it's a "CODAR" system, used to measure the motion of water waves and currents along coasts! :O
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