CREATE TABLE table_65418 ("Branding" TEXT, "Call-Sign" TEXT, "Frequency" TEXT, "Power  ( kw ) " TEXT, "Location" TEXT)

What's the call sign that has 20kw of power?
SELECT "Call-Sign" FROM table_65418 WHERE "Power (kw)" = '20kw'
SELECT "Call-Sign" FROM "table_65418" WHERE "Power (kw)" = '20kw'