Peter,

I agree that the presentation you linked to is one of the best out there.

If you remember one thing it is that the suppression is proportional to the square of the number of turns. The typical clamp-on ferrite is one turn (the wire goes through once). If you look at some of the suggestions you will see multiple turns. Two turns is four times as good, three turns is 9 time as good, etc.

And yes, everything has either a noisy processor or a noisy switching power supply. That is why another option is to use an external antenna away from all of the noise sources in the house.