There have been a few occasions when I could only see a single satellite with our tripod mounted triple LNB dish. All of those times I was able to hit either 72.7 (EA) or 129 (WA), so we at least got the majority of the available non-OTA HD channels. So far, we've never landed on a site where I could not find at least one bird, although we did have one COE site in PA where a strong wind gust would move a branch enough to knock out our signal momentarily. Having the ability to see both arcs is a big plus in my book.