I know this has been discussed before, but I can't seem to locate the posts.
The Talking House instructions state that if you are going to locate the wire antenna indoors, it should be in the center of the house, on the 2nd (or, presumably, higher if you have one) floor. It should not be strung up in front of a window, as glass (they claim) blocks RF in the AM range.
So I'm wondering, is that really the case? And what else would block (or at least diminish) AM signals (other than metal). PVC? Wood? Gyprock?