CREATE TABLE table_12657 ("Branding" TEXT, "Callsign" TEXT, "Frequency" TEXT, "Power  ( kW ) " TEXT, "Location" TEXT)

What is the frequency where the power is 25kw?
SELECT "Frequency" FROM table_12657 WHERE "Power (kW)" = '25kw'
SELECT "Frequency" FROM "table_12657" WHERE "Power (kW)" = '25kw'