CREATE TABLE table_1087 ("Call sign" TEXT, "Launched" TEXT, "Transmitting from" TEXT, "Coverage" TEXT, "Languages" TEXT, "Frequency" TEXT)

What frequency does Chihuahua Sinaloa Durango cover?
SELECT "Frequency" FROM table_1087 WHERE "Coverage" = 'Chihuahua Sinaloa Durango'
SELECT "Frequency" FROM "table_1087" WHERE "Coverage" = 'Chihuahua Sinaloa Durango'