why don't i have any sound in my truck after instslling a anew stereo?

I just hooked up a new cd player in my 04 Dodge Ram 1500. The unit comes on and works but there is no sound. The only thing is I didn't hook up the antaenna to the new head unit because I need an adapter. Are the speakers grounded through the anteanna, is that why everything else works but no sound? Any help would be appreciated
 
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