M0YOU (116km) has been spotted on 6m again this morning. He has also spotted me. On his signals are very clear signs of aircraft reflections with multiple traces visible. I think much of the GDX I am seeing on 10m upwards is due to aircraft. This mode seems good for at least 200km, but is transitory. Sometimes a badly Doppler shifted signal can be very strong but not decode. There are software programs to predict when aircraft will help. Many microwave DXers use such software.
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