CREATE TABLE table_43451 ("Frequency" TEXT, "Call sign" TEXT, "Branding" TEXT, "Format" TEXT, "Owner" TEXT)

Which Frequency has a Branding of country 600?
SELECT "Frequency" FROM table_43451 WHERE "Branding" = 'country 600'
SELECT "Frequency" FROM "table_43451" WHERE "Branding" = 'country 600'