I couldn't find the answer anywhere, so I'm sorry if this has been discussed before. I'm in Maryland and we have to upgrade to the 1000.4 Eastern Arc dish & my husband has decided to do it himself. I know that it can be mounted to the existing mast. We have 2 dishes right now. So my question is this. Which mast do we connect it to? The one with the Dish 500 on it or the other? Thanks in advance.