I was just told an interesting thing. I was told by my local vendor that for the 721 to work it has to "see" both 119 and 110. Up here in southeast alaska we can only see 119 reliably. While we can get 110 we need a two meter dish. So, can the 721 work with just a signal from 119? I have two receivers and still want to use my old 4000 and the new 721. I had been assuming that I could use a switch to split the signal from my dual LNB, sending one to the 4000, two to the 721 and terminate the left over. Scott or anyone else, do you know if this will work? Thanks...marshal