Frequency allocation. (Score 5, Informative)

Only a part of the spectrum mentioned in the article (from 30-300 GHz) is 'unlicensed', and it is all 'allocated' to some use. A very informative chart can be found at: http://www.ntia.doc.gov/osmhome/allochrt.pdf The bottom row shows the allocation of frequency space from 30-300 GHz. Dense to say the least.