The probe does have an AF/RF switch. But like I said, I never detected anything with the RF.
For your entertainment, here's about 28 seconds of audio/video. First 10 seconds are mid-volume, then the volume increases a lot, but not to the max. Sounds much worse if there's music in the background.
https://flic.kr/p/2nGTHre
The horizontal lines at the top appeared only after I adjusted vertical linearity, but I have to save that for later.