The DISH Network & DIRECTV Approved, STVC, provides low loss diplexing of DBS and TV signals, separating them prior to satellite receiver input. Filters harmonics in the off-air spectrum from satellite conversion devices. Power Passing to Satellite Port. Combines Satellite & Off-Air on One Cable Allows the combining of Off-Air / CATV signals with satellite signals to a common cable Low Insertion Loss with Outdoor Case for high isolation. Not meant for Dish Pro Plus Installations