“Marconi made the first demonstration of his system for the British government in July 1896. A further series of demonstrations for the British followed, and, by March 1897, Marconi had transmitted Morse code signals over a distance of about 6 kilometres (3.7 mi) across Salisbury Plain. On 13 May 1897, Marconi sent the first ever wireless communication over open sea – a message was transmitted over the Bristol Channel from Flat Holm Island to Lavernock Point in Penarth, a distance of 6 kilometres (3.7 mi). The message read “Are you ready”. The transmitting equipment was almost immediately relocated to Brean Down Fort on the Somerset coast, stretching the range to 16 kilometres (9.9 mi).”
Cable and Wireless Transatlantic Cable Landing Station is next to Brean Sands and is located in Somerset, England, United Kingdom. Cable and Wireless Transatlantic Cable Landing Station has a length of 0.34 kilometres.
Cold War interception out at Mark
Open secret there was a listening center out on the moors to intercept communications during cold war
Highbridge/ Portishead Radio click here