Why are they selling garbage that says"Public Thlephone"? Like I know the bar is low, but I refuse to believe that people don't notice the complete gibberish on those signs. Do people really just don't care?

"deleted rm -rf"? What? That's not how you... Does this guy know anything about computers?

Getting reminded of a piece of software, I think it was called "IKEA Home Planner" that I used to play with as a kid.

Ferrite beads are more broadband, the work by being lossy core to an inductor crated by the wire passing through it.

The answer is it depends, Here is a simulation of a filter I used for getting rid of RFI. As you can see it acts as a lowpass up to 150MHz where after a dip attenuation gets worse. The dip is caused by inductors SRF. It could work in your situation, it has more than 60dB att. around FM band.

Looking at the schematic of the ART preamp, it has no RFI filters, the 330pF capacitor will do nothing. My suggestion would be an RFI filter right in front of it. A ferrite choke might not be enough. If you can, build the filter yourself, it's much cheaper than ready made ones.

Turns out that the cheap USB-UART converter always reads back just a single byte. Second capture is with its TX and RX shorted, and somehow only one byte comes through.