Cambridge Bay LORAN Tower was a 189 m (620 ft) tall free-standing lattice tower at Cambridge Bay, Nunavut, Canada. It was built in 1947/48 for LORAN transmissions and was the tallest freestanding structure in Canada for several years. Later the tower was used as a non-directional beacon (NDB) and was often called the "CB" beacon after the morse code letters that it transmitted on 245 kHz, with an output power of 2000 watts. What appeared to be guy-wires on the tower were 'top loading' forming part of the antenna. The tower was four sided and the base 18 m (59 ft) per side or 324 m2 (3,490 sq ft).