Sorry to hear about your misfortune. Sounds like you will be able to fix it , though. You better make sure it is in fact the nearby radar installation that is causing the interference and not your plane itself. Check for any metal to metal contact on your horns, clevises, throttle arm, etc.

300sjack, Thanks for the info. I am planning on using a Magnum .91XLS with a Bisson Pitts muffler. I should have been clearer on my question about the extensions: What I really wanted to find out about was the aileron extension cords and their length.