I have installed a second LNB (with Bracket) on a 18" dish. The original LNB pointing at 92 indicates 89% signal strength but the second one pointing at 81 shows 5% signal strength. Any ideas?
91 and 82 individual are at different settings without the need of skew, when you put together in one antenna, it will be another setting AND skew. you will need some minor adjustment to the antenna.
go google the sat calculator or there are some links on some of the fta sites.