Amateurs who operate in the region must design and construct their own equipment, and those who do, often attempt to set communication distance records on sub-millimeter frequencies.
However, a number of administrations permit amateur radio experimentation within the 275–3,000 GHz range on a national basis, under license conditions that are usually based on RR5.565.
In October 2016, the UK regulator Ofcom made available a licence variation available to Full licensees for a series of bands within the 275–3,000 GHz range.
Applications for this can be obtained online via the RSGB website,[2] which also provides guidance on its use and the 20 km protective radii around UK radio telescope sites.
[4][5] On March 4, 2003, US stations WA1ZMS and W4WWQ set a new distance record of 1.4 kilometres (0.87 mi) on 322 GHz, using wide-band frequency modulation.