I have run a G23 on a FourStar 120 and currently have a G26 on a Giant SpaceWalker. Both engines were run with resister plugs and I have never experienced any interference at all. Both of my radios are plain old FM. (One is Futaba and One is Airtronics) 15 years or so ago I owned a Giant Sweet and Low with a Quadra 35. It also had a resister plug and an old four channel Futaba Conquest radio with not a sign of interference. All of these engines are or were Mag Ignition. The G26 has just been converted to CH CDI, again with no hint of interference. None have any special shielding and the coil wire is standard issue non-shielded type. Maybe I am just lucky. On a side note I have had glitching from some of my electric birds although that is another story for another forum.

Good Luck[8D]