I am currently using 2 DirecTV receivers with Tivo. They are both Hughes models - HDVR2 and SD-DVR80. My current satellite dish is an oval 3 LNB. I would like to add an HR22 or HR23 to my existing setup so that I can upgrade to HD. I understand that I will require the Slimline dish to access the HD channels. I would also like to continue using my 2 older receivers as well. Is this possible with the Slimline dish?