[hilbert42]

"The video looks convincing but it could also be faked"

I don't think it's faked, what's shown here is what you'd expect. I've been on 'live' FM towers and the RF burned holes in my jeans at my knees (my knees were rapped around the metal tower and the induced RF in the tower zapped holes through the material in my jeans and then burned holes in my skin).

On AM the sound that you're hearing is demodulation caused by resistive non-lineararity in the carbon caused by the burning/heating process. This is quite a common phenomenon with high powered AM transmitters.