I have a Hatz Classic. When I am flying - other aircraft tell me that my transmissions have so much background noise they can't understand me. I have a Terra com with Lightspeed headset and a mic muff with the small cut out over a foam muff. I hear myself on sidetone. I can broadcast on the ground and transmissions are clear. I have tried using a diffrent antenna with no noticable change. I am willing to change radios but unsure what might be better? A ll coments are welcome.