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Hi John, excellent & informed question. To get the maximum performance from your SureCall booster you need to have sufficient RF separation between the inside & outside antenna. In our experience 25' of vertical separation does the trick. I am assuming you do not have a metal roof... because that material will provide LOTS of RF separation. If you have an asphalt-shingle roof... 8 to 12' of vertical will not provide enough RF separation to allow your booster to operation at FULL GAIN. Options: 1) Install with minimal separation... the booster will automatically adjust gain and still might provide enough in-building coverage to meet your requirements. 2) Install a metal sheet in the attic between the roof antenna and the inside Flare 3.0 amplifier. I have attached an advanced installation guide which is more rigorous then 90% of our customers require... but it provides the advanced installation booster installation tricks to get best performance from your SureCall Flare 3.0 booster. https://www.surecall.com/support/uploads/specsheets/SureCall_Advanced_Install_Guide_Flare_3.0_CA.pdf
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