Let's put it this way. Is
VTV4 the only channel you and your family are interested in?? If this is the case, then I would suggest doing the pass through connection. If there are other channels you want to see, then you might want to go with a dual LNB and adding another cable which is the more expensive option, but I don't think you would be interested in the other channels anyway. Take a good look at Lyngsat.com , if there are other channels you want to see.