CREATE TABLE table_71968 ("Call sign" CLOB, "Frequency" CLOB, "City of license" CLOB, "Facility ID" FLOAT, "ERP / Power W" FLOAT, "Height m  (  ft  ) " CLOB, "Class" CLOB)

Name the class with call sign of wmhn
SELECT "Class" FROM table_71968 WHERE "Call sign" = 'wmhn'
SELECT "Class" FROM "table_71968" WHERE "Call sign" = 'wmhn'