Built by AT&T in Houlton Maine, this array of 4 phased beverage antennas was used for the first transatlantic phone system which began operation on the 7th of January 1927… The first conversation took place betweenWalter S Gifford, the president of AT&T, in NY, and Sir Evelyn Murray, the Secretary of the General Post Office, which managed the British telephone system at the time.
History Channel… The First Transatlantic Conversation (1 minute commercial before it starts)
Wikipedia … Good source for Beverage antenna history and more….
EDN Network … Good article with links on the first transatlantic phone call