Radio broadcasting to Cuba authorized by this subchapter shall utilize the broadcasting facilities located at Marathon, Florida, and the 1180 AM frequency that were used by the Voice of America prior to October 4, 1983. Other frequencies, not on the commercial Amplitude Modulation (AM) Band (535 kHz to 1605 kHz), may also be simultaneously utilized: Provided, That no frequency shall be used for radio broadcasts to Cuba in accordance with this subchapter which is not also used for all other Voice of America broadcasts to Cuba. Time leased from nongovernmental shortwave radio stations may be used to carry all or part of the Service programs and to rebroadcast Service programs: Provided, That not less than 30 per centum of the programs broadcast or rebroadcast shall be regular Voice of America broadcasts with particular emphasis on news and programs meeting the requirements of section
1463
(2) of this title.