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Message: <blockquote data-quote="s-band" data-source="post: 989328" data-attributes="member: 407744"><p>Trees seem quite close to an ideal black body as far as radiation is concerned. If your trees are at 290 deg K and your LNB+feed+side lobe noise figure is around 1dB then I think that you should see a variation of around 6dB between pointing the dish at clear sky and the ground (or trees). <a href="https://www.satellites.co.uk/forums/threads/invacom-0-3db-vs-octagon-pll-vs-smw-pll-ku-lnbs.169134/#post-981544" target="_blank">In this test</a> I used some microwave absorber as the ground noise source. The trees were about 0.5dB quieter. <a href="https://www.satellites.co.uk/forums/threads/channel-master-1-8-restoration.169213/#post-981926" target="_blank">See this post for some tests with the CM1.8</a></p></blockquote><p></p>