[tomfoolery]

That's a relatively small antenna. Have you considered mounting it on a J-pole on the outside? High up, they don't look nearly as big, by the way.

Neighbor across from me has the model house in the development, and has some type of foil behind the siding, which he warned me about. He had to position his two attic antennas to 'look' through the roofing, and they work just fine, but some location experimentation was needed. Mine similarly is aimed through the roof, though it's for convenience, as I don't have any metal foil in the walls.

Just another couple of data points.

Edit: I should mention that my attic install is far from ideal, but the signals are strong enough, and the antenna gain high enough with a narrow(ish) beam width, that it works well enough for me. But outside is better than inside, as a general rule.