DYE Stations were the eastern extension of the Distant Early Warning Line (DEW Line) in the North American Arctic throughout Greenland (DEW Greenland Extension, "DEW East") and Iceland. The DEW Line sites called DYE Stations were equipped with the 600 MHz AN/FPS-30 long-range radar within geodesic domes of about 60 ft (18 m) diameter. Crews were regularly supplied and rotated by C-130 Hercules (Hercs) aircraft of the 109th Airlift Wing (New York Air National Guard [NYANG]) staging through Sondrestrom Air Base.

The DEW Line became operational on August 13, 1957, with "CINCNORAD...operational control of the Cape Lisburne-Cape Dyer" radar stations as with other air defense elements. On June 30, 1958, the eastern DEW Extension had four stations and there were four Designated Engineering Representatives (DERs) and four airborne early warning and control (AEW&C) aircraft operating for the Atlantic Barrier and on July 19, 1958, DYE 1 (Qaqqatoqaq) (DYE 4 (Kulusuk Island) on August 3) was begun by Western Electric using helicopter-assisted sealift at the coasts and airlift from Sondrestrom Air Base for the interior stations.^{[citation needed]} By October 1, 1958, DYE communications were linked to the NORAD Combat Operations Center at Ent Air Force Base via the AT&T Denver Toll Test Center.

From 1954, the United States Air Force expected that the air defense radar network would have to extend across the North Atlantic to Europe or the Azores, and by early 1956 studies to this effect were approved by the Joint Chiefs of Staff. After successful completion of the DEW Line, in 1957 U.S.-Canadian attention turned to the implementation of plans to close the North Atlantic radar gap with physical stations to replace the radar early warning aircraft EC-121 Warning Stars then patrolling the ocean. Arctic veteran, Colonel Bernt Balchen, preferred a line going north around Greenland's polar coast, and others suggested a coastal line south to Cape Farewell, but eventually the service settled on a direct line across the ice cap to Iceland, the Faroes, and the United Kingdom. An initial plan to place a main station at Kangeq near Cape Farewell was abandoned before construction began.

Negotiations with Denmark, concluding with an agreement on 20 March 1958, settled on four stations in Greenland, one on a mountain near Holsteinsborg (Sisimiut), two innovative sites in central Greenland, and one at Kulusuk on Kulusuk Island near Tasiilaq (formerly Angmagssalik) on Ammassalik Island, not too far from the former United States Army Air Forces airfield Bluie East Two. The Danes raised objections to the Kulusuk site due to fear of undesirable fraternization with the inhabitants of a local Inuit village. The result was that the DYE-4 site there was placed off-limits to locals, although this policy failed resoundingly. Legally, the DYE-1 through -4 were annexes of the Sondrestrom joint Danish-American Defense Area under authority of the 1951 Greenland Bases Treaty. Unlike the case with the other United States bases in Greenland, Denmark took no interest in the DYE stations and, except for engineering operations, did not participate in their operation; and unlike other United States bases, they did not become a cause for domestic controversy.

Since the stations were built at high elevations, surveys indicated that during normal propagation conditions they should essentially close the gaps across Davis Strait and Denmark Strait, the latter with the aid of a later radar station at Ísafjörður at the northwestern corner of Iceland. Construction was influenced by mixed experience with two earlier ice cap radar stations near Thule Air Base, now Pituffik Space Base, (Site 1 and Site 2). The new design used pillars which would delay subsidence of the station into the ice. In this sense the stations were similar to the Texas Towers that had been built for air defense radars in coastal waters off the United States, except that the "tripod" was anchored in the ice, and the legs were eight massive steel beams. Periodic re-alignment of the station could be accomplished by adjustment of the beam attachments. At the inland stations, the nearly horizontally pointing tropospheric scatter (troposcatter) parabolic antennae had to be enclosed as part of the superstructure.

Snow accumulation of about 1 m (3 ft 3 in) per year caused subsidence which eventually necessitated a re-foundation. In 1977 and 1982, Danish Arctic Contractors carried out a delicate re-pillaring of the two ice cap stations through a “jacking-up” procedure that also laterally moved the station.

The DEW data center (call sign DYE, 66°40′N 61°21′W / 66.667°N 61.350°W / 66.667; -61.350) at Cape Dyer on the eastern tip of Baffin Island was 1 of 4 "Canadian Main stations" (cf. PIN, CAM, FOX) and in January 1959, the station's manning switched to an Royal Canadian Air Force (RCAF) squadron leader being the "Officer-in-Charge" as "DEW Sector Commander", 1 of 5 RCAF officers at DYE (2 additional officers were USAF).

For closing dates and current status of the DIY-1 to DIY-5 sites, see the table of DEW Line sites not included in the North Warning System.