Good morning, I have a legacy setup, 3 sats going to an SW64 then to 4 receivers (1 508 and 3 510's) I would like to add either a 921 or 942 and keep all four receivers or get rid of one. Is this http://www.dishnetwork.com/download...n/install-5.pdf the only way to accomplish this? I'd rather not switch to dish pro as my sats are really high up on the roof and not easily accesible to swap out the lnbf's. Thanks.