However, there's one bit of experience. If I connect my guitar to the wah pedal with the short "noiseless cable", and the wah to the effect with the long new cable, the radio chatter is gone. However, the screetching noise whihc comes and goes stochastically does not dissapear.
Regarding that, my idea is the following. The thing has to do something with my pickups. Somehow these extra noises are coming from them. Reason? When I touch the strings, it's not that loud anymore.
Other idea. Somehow I created a nice juicy loop with the cable, and it acts as a simple radio antenna. I don't know, I think, I'll check on is.
I'm going to disconnect my pickups to see what happens. If there's a problem with any of the pickups, this will at least reveal it.
Be back with results.