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Your antenna cannot be connected to your surround sound receiver, that's not how it works. Additionally, a simple converter box will only provide two channel stereo (DD2.0), it will not provide DD5.1 audio support. You might get by with one of the HD converters with a digital audio output, but it will depend on your inputs to your HT receiver and whether or not you can synchronize the audio to the video.
Frankly, you likely need a new TV if you really want DD5.1.
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