A number of administrations permit amateur radio experimentation within the 275–3000 GHz range or at even higher frequencies on a national basis, under license conditions that are usually based on RR5.565 of the ITU Radio Regulations. Amateur radio operators utilizing submillimeter frequencies often attempt to set two-way communication distance records, In the U.S.A. WA1ZMS and W4WWQ set a record of on 403 GHz using CW (Morse code) on December 21, 2004. In Australia, at 30 THz a distance of was achieved by stations VK3CV and VK3LN on November 8, 2020.