The solarium is on the south side of the house, and yes, XM recommends a southern direction for the antenna. In the testing we done, we can move it from the solarium glass to a regular window about 2' away and have the four full bars.
Another test we decided to try was opening one of awning windows in the solarium, with the window open about 12", held the antenna on the exterior side of the glass....full four bar reception, when the antenna was moved to the interior side of the glass, nada, zilch, no signal at all. The only differance from the regular themal window with low E glass where the antenna has full reception and the solarium glass where it has no reception is the argon gas. So if it is not the gas then perhpas I have a poltergeist in the solarium.
