CREATE TABLE table_204_12 (id DECIMAL, "area served" TEXT, "city of license" TEXT, "vc" DECIMAL, "rf" DECIMAL, "callsign" TEXT, "network" TEXT, "notes" TEXT)

which area has the largest number of stations serving it ?
SELECT "area served" FROM table_204_12 GROUP BY "area served" ORDER BY COUNT(*) DESC LIMIT 1
SELECT "area served" FROM "table_204_12" GROUP BY "area served" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1