garbled sound - could it be antenna?

Solution
Not likely.
If it happens with external sources as well as the over the air channels it is the TV for sure.
If it happens only on over the air channels there could be an problem with the tuner in the TV. If you can try a different antenna easily then do that.
You could try to unplug the TV from AC for 5 minutes and plug it back in.
Not likely.
If it happens with external sources as well as the over the air channels it is the TV for sure.
If it happens only on over the air channels there could be an problem with the tuner in the TV. If you can try a different antenna easily then do that.
You could try to unplug the TV from AC for 5 minutes and plug it back in.
 
Solution