CREATE TABLE table_35109 ("Callsign" TEXT, "Area served" TEXT, "Frequency" TEXT, "Band" TEXT, "Freq currently" TEXT, "Purpose" TEXT)

Which freq currently has 0 657?
SELECT "Freq currently" FROM table_35109 WHERE "Frequency" = '0 657'
SELECT "Freq currently" FROM "table_35109" WHERE "Frequency" = '0 657'