The longwave radio mast Hellissandur is a 412 metre high guyed radio mast for longwave transmissions at Gufuskálar in the vicinity of Hellissandur on the Snæfellsnes peninsula of Iceland. This mast, which is the tallest structure in Western Europe, is insulated against the ground and guyed in five levels by steel ropes, which are subdivided by insulators. It was built in 1963 as replacement for a 190.5 metre (625 ft) tall LORAN-C tower, which was built in 1959, for the North Atlantic LORAN-C chain (GRD 7970).