I have a Samsung SIR-TS360 Directv HD tuner with an OTA tuner built in. I recently switched to Dish and am trying to sell this unit on eBay. I had a question from a potential buyer that I cannot answer. He wants to know if a Directv subscription is required to enable OTA tuner? Or does the OTA act independent, allowing him to possibly just buty this to serve as his OTA tuner. Anyone know how this technology works?