CREATE TABLE table_39331 ("Call sign" TEXT, "Frequency MHz" FLOAT, "City of license" TEXT, "ERP W" FLOAT, "FCC info" TEXT)

What is k275av call sign's highest erp w?
SELECT MAX("ERP W") FROM table_39331 WHERE "Call sign" = 'k275av'
SELECT MAX("ERP W") FROM "table_39331" WHERE "Call sign" = 'k275av'