CREATE TABLE table_48415 ("Call sign" CLOB, "Frequency MHz" FLOAT, "City of license" CLOB, "ERP W" FLOAT, "Class" CLOB, "FCC info" CLOB)

What is the highest ERP W with a w216bo call sign?
SELECT MAX("ERP W") FROM table_48415 WHERE "Call sign" = 'w216bo'
SELECT MAX("ERP W") FROM "table_48415" WHERE "Call sign" = 'w216bo'