CREATE TABLE table_32806 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "TV Time" TEXT)

Which opponent was playing on December 20, 1998?
SELECT "Opponent" FROM table_32806 WHERE "Date" = 'december 20, 1998'
SELECT "Opponent" FROM "table_32806" WHERE "Date" = 'december 20, 1998'