The governments of all political jurisdictions (city, county, state, country, etc.) may regulate, tax and sell electromagnetic spectrum frequencies for active use. However, all levels of government (with permission from higher levels, if necessary) should have the right of eminent domain to any portion of the electromagnetic spectrum so long as they notify users with plenty of time and compensate them fairly for the costs and inconveniences involved in the transitions. Passive use of the spectrum (ex. telescopes, radio receivers) would not be taxed or regulated.