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OK ~ try this... Connect a makeshift antenna to your Antenna proper connection/connector.
Almost anything somewhat large, flat and is metal should work OK... Even a length of old lamp cord may work too! Hopefully you are in range of at least ONE standard HDTV DIGITAL broadcast transmitter(s) "over the air".
IF your audio is now OK suspect that CABLE BOX!
And how about your DVD player? Is your audio and video good using it?
Most of HD channel broadcast in 5.1 channel sound. Regular channel broadcast in 2.0 channel sound. You TV only have 2 speakers so you will expect the sound will be low compare with the regular channel.