47 U.S.C. § 304 : US Code - Section 304: Waiver by license of claims to particular frequency or of electromagnetic spectrum

Search 47 U.S.C. § 304 : US Code - Section 304: Waiver by license of claims to particular frequency or of electromagnetic spectrum

No station license shall be granted by the Commission until the
applicant therefor shall have waived any claim to the use of any
particular frequency or of the electromagnetic spectrum as against
the regulatory power of the United States because of the previous
use of the same, whether by license or otherwise.