Disclaimer: I do not work for DirecTV (and I'm not an installer).
Your dish will have 1-3 knobs on it called LNB's. Each LNB corresponds to a coaxial output. With 1 LNB, you will only be able to receive programming from the main satellite. If you want to receive HD channels (which requires a special receiver) or special packages (like Chinese or Spanish programming) you will need multiple L
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