I love this kind of research! Anyway, I had downloaded this app from the Apple App store, called (Audio Spectrum Analyzer), which detects sound frequency, and is a decibel meter. I then turned on the screen recorder on my phone, and turned it to Fox News to a clip about Hunter Biden’s laptop. These are the Hertz frequencies that continously appeared: (5039, 0396, 0314, 0629, 0500, 0250, 0198, 1259, 1000, 1587, 2000, 8000).
From this Fox video:https://youtu.be/ZP15lm7FXwQ