If i connect the hdmi cable i do not need an antenna cable?

You need an antenna cable to be connected to something that is connected to your tv or you will not get a signal!

If the cables HDMI and Coax are connecting the same device to the TV no, one or the other. If you have a choice take HDMI . If you have a antenna and that is how you get your TV shows then it will need to be hooked to something, DVD player , TV set etc

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