Ok all, I recently bought a second home and have taken a receiver there to have dtv. The receiver worked great for all channels except locals, as explained in a previous post, more than likely out of spot beam. Well I hooked up a AM21 with antenna today and now nothing is working. After looking into the setup a little more I am thoroughly confused. The dish, a slimeline, has one wire coming out of the lnb, so I assume a SWM? Bare with me, I am pretty green here. It goes to a splitter below the dish that goes to two different rooms, we're only using one. I see no power anywhere? I thought an SWM needed some sort of power? Checked all cables and nothing has actually changed except the AM21 connection, now removed. So one RG6 from the slimeline dish to the receiver with nothing in between and it was working for all but locals. Now just getting a 771A error? Any input would be appreciated. I have double checked all cables, everything looks fine all the way from the dish to the TV? Receiver is an HR21. Followed all lines from receiver to dish, no PI and it was working for several days?