[1] Due to the lack of commercial off the shelf radios, amateurs who operate on the 1 mm band must design and construct their own equipment, and those who do, often attempt to set communication distance records for the band.
[1] The current world distance record on the 1 mm band was 114 kilometres (71 mi) set by US stations WA1ZMS and W4WWQ on January 21, 2008.
[4][5] The longest distance achieved on 1 mm in the United Kingdom was 9.33 kilometres (5.80 mi) between stations G0FDZ and G8CUB on April 30 2019.
[5] In Australia, the 1 mm distance record was 10.8 kilometres (6.7 mi) set by stations VK3CV/3 and VK3NH/3 on August 5, 2024.
[w] HF allocation created at the 1979 World Administrative Radio Conference.