CREATE TABLE table_36772 ("Call sign" TEXT, "Frequency" TEXT, "City of license" TEXT, "Facility ID" FLOAT, "ERP / Power W" FLOAT, "Height m  (  ft  ) " TEXT, "Class" TEXT)

Which Frequency has a Facility ID of 13598?
SELECT "Frequency" FROM table_36772 WHERE "Facility ID" = '13598'
SELECT "Frequency" FROM "table_36772" WHERE "Facility ID" = '13598'