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You would need to understand the propogation characteristics of RF to explain the reason. The signal would most certainly not be eminating from a reflection in space.
It would have been the return echo of a signal bounded by the troposphere that has circumnavigated the earth many times before being picked up again.
In 1929 there would hot have been so much spurious emmission at 31 metres to mask the return echos of these occasionally happenning phenomenae that did and still do occur.
If you listen to short wave broadcasts you will often notice the effect of signals circumnavigating the earth by the echos and often multiple echos that accompany the direct signal.
Barry
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