To open the safehouse safe, you'll need to complete a series of safehouse puzzles, which we break down in more detail with the aforementioned link.
Each radio has you do the same thing, which is alter the amplitude and frequency of a waveform to make the two lines match by increasing the amplitude to make your waveform as tall as the other one, then increase or decrease the frequency until they line up.
Once you're close, the lines will snap together. With this done, the radio will begin playing a message on repeat, a series of four numbers will be read out, and this is the code for the nearby safe.
A notification will pop up showing you that a radio is in close proximity. Use the distance indicator to close in on the radio and interact with it.
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