I upgraded to HD last month.After a big hassle about sat 129(no los) we came up with solution. Sats 110,119,61.5 and 72.best signal on 110 ,82% where I used to get many sd channels.72 is lowest at 42%.When tech did first check switch he forgot to hook up 110.He then hooked it up did check switch over ,all ok.However I now notice most of my sd channels are on 72.Could the way he did the check switch have anything to do with the change and if so how do I change it back to 110.How about unpluging 72, do a check sw. hook it back and redo check sw.?I have to get some trees cut and go to the EA 1000.2.That will be a lot better than 3 dishes on my house.