Advertisements tivo series 3 HD + Samsung 5044 inputs = antenna for OTA HD, standard cable for other channels the OTA antenna may be unneccessary. I found that, by hooking the Comcast cable directly to the TV last night, I can get the main networks in HD over the cable. (The Samsung auto-detected all SD stations and all non-encrypted HD stations). Yet when I run only the cable into the TiVo, and not the antenna, the HD channels are not detected. Please help. Thanks.