X station

plural X stations

1. CanadaUSA Mexican broadcast station whose signal overpowers those of stations in the United States.

   X-station broadcasts could be heard occasionally in every region of the United States and in Canada, though it is difficult to know who listened to them.

   2015, Bill C. Malone, David Stricklin, Southern Music/American Music, page 73

   1 more example

   Not long after the feds started regulating radio, Mexico's megawatt border blasters—high-powered stations planted just south of Texas and California—started beckoning. The FCC couldn't control them […] That same year, the Mexican government revised its radio licensing law, drastically reducing the X stations' autonomy.

   2004, Jesse Walker, Rebels on the Air: An Alternative History of Radio in America, page 197