Radio Clandestine was one of the main U.S. pirates on shortwave in the 1970s and 1980s — this recording was made in Washington, DC on a Hammarlund HQ-180A. I do not recall the frequency. This recording includes the famous spoof of Radio Moscow…and sign off with the equally famous R.F. Burns. At another link here in the archives, Andy Robins provides a separate recording of Radio Clandestine recorded in 1980 and notes that the station was known for using frequencies inside the regular shortwave broadcasting bands, unlike other pirates that tended to use frequencies just above or below the 40-meter amateur radio band.

Many thanks to SRAA contributor, Dan Robinson, who shares the following recording: