Yes. get an antenna. They come in all shapes and sizes (and prices too) the cheaper ones will have a limited range but the pricier more quality ones will get you better signal on the standard channels and increase your range to pick up more channels.
Simply screw the RCA cable connection into the RCA input on the back of the TV then go to the antenna input and proceed to open the TV menu and scan for channels.
But just to be sure you don't have a model that got rid of this (highly doubt it) what model Vizio do you have?