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Did Marconi really receive a radio signal from across the Atlantic in 1901?  I understand there were literally dozens of other people "on the air" at the time of his trans-Atlantic wireless experiments and the Morse code "S" could have come from a relatively nearby transmitter.

Yes, I have also heard that a number of stations were on the air at the same time as Marconi's experiments. It has been pointed out the actual propagation of a signal over a distance of 2100 miles was very unlikely at the general frequency that was being used.  The validity of Marconi's claim of having detecting trans-Atlantic signals from Poldhu, Cornwall is brought into doubt by the presence of these other RF emissions, some certainly closer to his Newfoundland receiving site.

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