I know Tom Bearden knows a lot about scalar waves. He was supposed to start making his free energy and health devises a year or two ago, but it doesn't look like he has yet. His site is at: http://www.cheniere.org/
I know Eric Dollard is supposed to be the modern day Tesla, so he may be good to look at too.
I don't know what you mean by "But where is it the killing snake of a wave, frequency" for sure. Are looking for the frequency that kills parasites?