CREATE TABLE table_204_508 (id DECIMAL, "no." DECIMAL, "race title" TEXT, "track" TEXT, "date" TEXT, "tv" TEXT)

what was the number of races aired only by fox ?
SELECT COUNT("race title") FROM table_204_508 WHERE "tv" = 'fox'
SELECT COUNT("race title") FROM "table_204_508" WHERE "tv" = 'fox'