User:Sparkgap/Radio astronomy frequency allocations

Radio astronomy frequency allocation is done by national telecommunications authorities. Globally, the International Telecommunication Union (ITU) oversees how much radio spectrum is set aside for radio astronomy observations. Radio telescopes are free to use any frequency within the radio spectrum; however, only certain bands are specifically reserved for astronomical observations. The specific frequency allocations vary from country to country and between ITU regions as specified in the current ITU frequency allocations for radio astronomy.

Overview
Spectral lines

Interference issues

No transmissions allowed

Primary status

Secondary status

Shared with radio communications

Footnote status - EG: no allocation, but usage noted.

Should ITU footnotes be reviewed?
 * What of the ITU's "SETI" footnote?