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Whilst Marconi is recognised for proving that radio waves could span continents when, on 2nd December 1901, the letter "S" was transmitted from Poldhu in Cornwall and was heard at Signal Hill near St John's in Newfoundland.
Although messages were sent across the Atlantic on various occasions after that  date, it was not until 10th January 1906 that the first two-way transatlantic radio telegraphy transmission took place. Led by Reginald Aubrey Fessenden, stations at Machrihanish and Brant Rock, Massachusetts USA regularly exchanged messages across the Atlantic Ocean from that date and into early summer on frequencies in the 80-100 kHz band.
However disaster struck on December 6, 1906, "owing to the carelessness of one of the contractors employed in shifting some of the supporting cables," the Machrihanish radio tower collapsed, abruptly ending the transatlantic work before it could ever go into commercial service.
Going to the site today you can still see the original concrete works that were placed to support the 1906 tower and operating buildings.
If you look at the photo to the right then you will find that the cache is located where the operating 'house' was to the right of the foot of the tower.
The area around here is open and you can easily walk about and discover the numerous support points that still exist today.
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