The North Atlantic Radio System (NARS) was a chain of 5 tropospheric scatter communication sites. It was an expansion of the former Distant Early Warning Line (DEW Line). NARS has been built for the United States Air Force (USAF) by Western Electric (AT&T) and its sites were maintained under contract by ITT Federal Electric Corporation (now ITT Federal Services Corp.). All NARS stations were supervised and controlled by the USAF, by agreement with the Canadian and Danish Governments. Historical information In the early 1950s arctic surroundings and weather conditions of northern Canada made construction and manning of HF and VHF radio or microwave relay stations almost impossible. However, there was an urgent need of reliable data and communication facilities from the radarstations in the north to their control centers in the south. The initial phase was using tropospheric scatter radio communication (troposcatter). Powerful radio signals in the kiloWatt range were scattered off the troposphere onwards to distant receiving stations using gigantic ‘billboard’ like antennas picking up just a fraction of the transmitted signals which had been scattered forward, meaning that the antenna and equipment maintenance and alignment had to be executed very carefully. Construction of this system coded Polevault started in 1954, becoming ops in 1955 and becoming extended as of 1956. This troposcatter system had been supported by an undersea datacable system stretching from Thule airbase Greenland via Cape Dyer to Newfoundland Canada. The undersea cable system however appeared to be unreliable being cut many times by trawlers and icebergs so a better data transfersystem was definitely needed. As of 1962 the new Semi Automatic Ground Environment (SAGE) system led to a gradual shut down of the Polevault system. SAGE consisted of large computers and associated networking equipment that coordinated data from many radar sites and processed it to produce a single unified image of the airspace over a wide area. SAGE directed and controlled the former North American Air Defense (NORAD) response to a Soviet air attack, operating in this role from the late 1950s into the 1980s. Construction of the large Ballistic Missile Early Warning System (BMEWS) radars at Thule airbase and at Fylingdales (UK) and another radar chain through Greenland, Iceland and the Faroe Islands also called for new powerful troposcatter communication stations linking all radarsites to the NORAD Hq at Colorado (US). This communication chain became known as the North Atlantic Radio System (NARS). Equipment