The hole "you have to keep everthing at least 12" from everything else" ideology just isn't true. Like dirtybird said, what you need to do is find the source of the radio noise and fix it. I have my ignition switch and ignition battery about 4" from my receiver switch and receiver battery (they are mounted to the fuselage sides directly across from each other) in my Laser with Brison 3.2 and have no interference issues. I highly recommend the Bosch shielded cap as tkg suggests. It does a great job suppressing electrical noise. Good luck!