CREATE TABLE table_78998 ("Call sign" TEXT, "Frequency MHz" FLOAT, "City of license" TEXT, "ERP W" FLOAT, "Class" TEXT, "FCC info" TEXT)

What was the class for Appleton, Wisconsin?
SELECT "Class" FROM table_78998 WHERE "City of license" = 'appleton, wisconsin'
SELECT "Class" FROM "table_78998" WHERE "City of license" = 'appleton, wisconsin'