Where is the station with a coverage of yucatán quintana roo campeche transmitting from?
CREATE TABLE "stations" (
  "call_sign" text,
  "launched" text,
  "transmitting_from" text,
  "coverage" text,
  "languages" text,
  "frequency" text
);
SELECT "transmitting_from" FROM "stations" WHERE "coverage"='yucatán quintana roo campeche';