CREATE TABLE table_38059 ("Call sign" TEXT, "Frequency MHz" FLOAT, "City of license" TEXT, "ERP W" FLOAT, "Class" TEXT, "FCC info" TEXT)

Which Frequency MHz is the highest one that has a Call sign of k241an?
SELECT MAX("Frequency MHz") FROM table_38059 WHERE "Call sign" = 'k241an'
SELECT MAX("Frequency MHz") FROM "table_38059" WHERE "Call sign" = 'k241an'