Hello, I am interested in getting OTA HD local channels. I currently have a DirecTV standard definition system and bought the Sony KDF-E50A10 which includes the ATSC tuner. My question is: what is the best way to get the local HD channels. I think I read somewhere that I can buy two Diplexer to combine and separate the satellite and antenna signals, this will allow me to use the same RG6 cable that runs from the dish to the receiver. I am new to HD installations so please if I am lost let me know. Also what kind of antenna I should buy for OTA local channel. I live in NYC. Thank you.