Im stepping up into a little bit bigger jon boat (15 to a 16) and Im going upgrade electronics. Im leaning toward a 522C on the front deck but I notice that bass pro has it listed with either and internal or external antenna. I'd like to go with an internal....since it eliminates one more thing to mount (antenna). Does anyone own one with an internal antenna and if so are you satisfied with it? As far as the back deck goes......im drooling over side imaging from Humminbird but am trying to kick myself in the butt to part ways with that much money.