used The NARS used AN/FRC-39(V) and AN/FRC-56(V) transmitting and receiving equipment, manufactured by Radio Engineering Laboratories, which could be configured for 1 kW, 10 kW or 50 kW power output depending on the range and/or quality of signal required. NARS sites were configured for 10 kW output, with the exception of site 41 in both directions and site 42's connection to site 41. Each set consisted of 2 transmitters and 4 receivers, for redundancy and to boost signal to noise ratios, using vacuum tube technology which proved time-consuming to maintain at high levels of efficiency. The 50kW used 120 ft antennas and the 10kW shots used 60 ft antennas. Equipment was configured for Quad diversity as follows; Polarity diversity, Space Diversity, Frequency Diversity and Combiner diversity as was typical for most Tropo-scatter communications over difficult paths. Levels of service proved extremely variable with the effects of weather and finicky equipment frequently causing loss of connection. Improvements were gained through better maintenance procedures but did not change significantly until the introduction of solid state technology, with the system able to transmit at 9.6kbit/s, (a very fast internet connection for that time), by the time the system was closed down in 1992 after 30 years of service. With the advent of satellite communications (SATCOM) the days of the Troposcatter networks were over, but NARS was closed down early due to the loss of the DYE-2 DEW Line station in 1988, severing the networks connection with the rest of the DEW line. Site 46 also had to close to make way for the new BMEWS Phased Array Radar at RAF Fylingdales. NARS sites From 1960 the troposcatter sites were built as: Site 41 – Keflavic Air Base Keflavik at grid 64°02′07″N 22°39′16″W in the SW of Iceland 1952–1992. The west facing antennas/building was Dye 5 and Tech Control. This shot was a 50kW shot to Dye 4 in Greenland. The east facing antennas/building shot to NARS site 42 at Hofn Iceland and was also a 50kW shot. The dividing line between the Dew Line system and the NARS system was between the two buildings. Today the site is closed, the Tropo towers are gone and all buildings have been removed. Site 42 – Höfn, Iceland at grid 64°14'38"N 14°57'50"W was a dual-purpose troposcatter radio comms relay site sharing its location with the USAF/NATO radar station at Hofn from 1961 – 1992 until its