FCC measurements reported that even in major urban areas, only about 30% of allocated radio spectrum was being used at any one time.
Sources
- Open Spectrum (queue.acm.org)
- https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/9769692 (image-ppubs.uspto.gov)
- https://transition.fcc.gov/sptf/files/SEWGFinalReport_1.pdf (transition.fcc.gov)
- https://sites.nationalacademies.org/cs/groups/bpasite/documents/webpage/bpa_048826.pdf (sites.nationalacademies.org)
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