A DISH Pro Twin LNBF looks at the 110 and 119 orbital locations, using a 20" (or "DISH 500") dish antenna. The DISH Pro Twin LNBF can directly connect to two tuner inputs (either two "single tuner receivers" like DISH Pro 301 or DishPVR 501, or one "dual tuner receiver" like DishPVR 721). The DISH Pro Twin LNBF can connect to a DISH Pro DP34 switch, for more receivers, or additional orbital locations, a switch is required in the installation.