I am pretty convinced that some of my 6m and 2m WSPR spots are only possible when aircraft are in the right place at the right time with acceptably low Doppler. This evening Eddie G3ZJO was spotted several times with quite high Doppler on occasions. I am not convinced that I am copying Eddie as a result of planes - I think his signal is copied by pure tropo, but I am convinced some signals are only copied as a result of aircraft reflections, much as happens on bands like 23cms upwards. G3WKW (134km) is an example of a station I only seem to copy by aircraft reflection on 6m and 2m.
G3ZJO has analysed M0YOU's signals in his blog. See http://g3zjo-radio.blog.co.uk/2015/05/11/six-meters-aircraft-reflections-20343648/ .
11 May 2015
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It's a fascinating pursuit, trying to figure out the origin of those strange reflections! Gets complex with mil aircraft, not visible on the net 'radar', and civilians who may not be squawking.
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