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Installing outdoors isn't an option for me unless I install behind the house and below roof line.
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If you are limiting your antenna installation options due to an HOA, landlord, or other local rules, you should be aware that there is an over-the-air reception devices ("OTARD") rule provided by the federal government. This rule protects your right to install a mast and antenna on the roof in most situations (a few exceptions do exist). Being a federal rule, this takes precedence over any landlord, HOA, city, county, or state level restrictions that might exist.
You can learn more about the OTARD rule on the FCC's web site
here.
An antenna above the roof line will almost always provide the best results (cleanest and strongest signal).
If you ultimately decide to still go with an attic installation, there will be some signal loss due to the building, and more signal reflections (a form of interference) to contend with. Since your "green" signals are starting out strong, it should be possible to make an attic installation work, but there are just a few more things to take into consideration.