Like a crystal wine glass being shattered by a sound, a cancer cell must have a fundamental frequency that it is vulnerable to, that would leave healthy cells undisturbed.
Different cancers would, of course, require different frequencies, maybe even changing from person to person.
This seems more sophisticated than just choosing the right frequency. From what I have read so far, it's circularly polarized short bursts of rf, and judging by the picture, it may require the body being in a large magnetic field to work correctly.
This guy has unlocked some kind of resonance of which we were previously unaware, and it has some sort of specific and controllable chemical effect on cellular tissue.
My original thinking is that just getting bad cells to absorb the energy from the RF would break their structure through heat generation, but this seems more clever than that.
I have studied “sound” frequencies for a long time now. And while I understand this is RF rather than sound I think Badger is on to something with his direction. I too think sound frequencies can be used for something like this. Sound frequencies has some amazing physical properties.