CREATE TABLE table_5380 ("Date" TEXT, "Opponent" TEXT, "Score" TEXT, "Loss" TEXT, "Attendance" FLOAT, "Record" TEXT)

Which Attendance is the highest one that has a Record of 15-28?
SELECT MAX("Attendance") FROM table_5380 WHERE "Record" = '15-28'
SELECT MAX("Attendance") FROM "table_5380" WHERE "Record" = '15-28'