Tv Reception.
The metal backed insulation , Radiant Barrier , and other brands and types and kinds of Metal Insulation are a real problem causer for Tv reception when the antenna is in the attic.
The Tv transmissions bounce all around in the attic , multipath , and raise heck with reception.
Digital Tv tuners can deal with multipath up to a certain point and then the tuner is over loaded with multipath.
You can try different antenna locations in the attic.
However those 2 channels can clear up and other channels will give problems.
You will most likely move the antenna to above the roof.
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