kksiu, if you haven't figured it out yet, I have one more suggestion. If you have the antenna of the reciever running through a tube inside the fuselage, pull it out, run it outside on the bottom, tape it to the fuselage. I have had 2 airplanes with the nifty antenna tube, and neither one would work if it was run inside the tube. Range checks with the antenna in the tube, engine running5 ft. moved antenna outside on the bottom of the plane-300ft. TX antenna FULLY collapsed.