I do agree with G0MJW. The problem is that you can not put the lens of the POTY into the focal point of the antenna as you do with the LNB its self. Therefore the reception is poorer than the one made only with the LNB. As for the Helix I have not tried yet, but it looks that the cap of the LNB is closer into the focus of the dish. Therefore we should expect better reception than the one with POTY.