Centre National d’Études
Spatiales (CNES) French space agency scientist and astronomer, Dr.
Claude Poher recently considered this problem in terms of plasma physics. See:
Claude Poher, “5-9. The Loss of VHF Transmissions,” in Analysis
of Radar and Air-Visual UFO Observations on 24 October 1968 at Minot Air Force
Base, ND (2005).