The government is not 'owning the spectrum'. If you go outside of the US you can do whatever you want (well, not in practicality, but in theory, I guess maybe in practicality if you go far enough (like the moon)).
The government is controlling the air space (just like land space and sea space) (and in that air space, allows different parts of the electromagnetic spectrum to be used for different things, and in a certain part has more detailed rules of use.).
JM
The government is controlling the air space (just like land space and sea space) (and in that air space, allows different parts of the electromagnetic spectrum to be used for different things, and in a certain part has more detailed rules of use.).
JM
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