Good to know.
I don't know if this works, but saw in Hornet section how someone spliced from the black wire of the ESC's battery connection and grounded it on one of the motor mount screws. Real simple to do, he claimed he had a Radio Shack EF meter of some type, went from reading 5 bars (lots of EF interference) to less than one bar due to the grounding wire. If you want more info, I'll dig up the thread so you can link to it. Props to the original poster of that thread BTW. I'm a noob, just taking info and trying to share what little I know in return.