Which long range AM station has the lowest frequency and includes a webcast of listen live, was licensed in the city of Monterrey, and uses the Callsign of xet?
CREATE TABLE "long_range_am_stations" (
  "frequency" real,
  "callsign" text,
  "brand" text,
  "city_of_license" text,
  "website" text,
  "webcast" text
);
SELECT MIN("frequency") FROM "long_range_am_stations" WHERE "webcast"='listen live' AND "city_of_license"='monterrey' AND "callsign"='xet';