Dish aerial TV installation (commonly called dish) is a type of receiving antenna system for television signals, used mainly in North America and South America. The dish consists of a large, fixed polygonal mirror or array, with radiation emanating directly downwards. The polygonal shape reduces the number of required broadcast television stations that need to be received in order to receive a specific channel; as a result, the dish can be used to receive more channels than a flat-panel receiver. Dish antennas can also be pointed in multiple directions to receive different broadcasts from multiple stations.