I am not using a resistor plug, just the one that came in it. I have tried two different receivers, both Hitec, and routed the antenna several different ways. Going straight out the top and straight up gives a little better range, but a plane with a two foot whip antenna is not what I want. I have also tried two different transmitters, both Futaba and Hitec, with same results. I finally got some braided tube and covered the plug wire and cap. Bingo! I can now get about 110 ft without servos jumping. I might try the NGK plug to see what it does. Is it a resistor plug?