CREATE TABLE table_71969 ("Call sign" CLOB, "Frequency" CLOB, "City of license" CLOB, "Facility ID" FLOAT, "ERP / Power W" FLOAT, "Height m  (  ft  ) " CLOB, "Class" CLOB)

Name the frequency with class of b
SELECT "Frequency" FROM table_71969 WHERE "Class" = 'b'
SELECT "Frequency" FROM "table_71969" WHERE "Class" = 'b'