I asked the entire question in the thread title.
Once there's an answer to this maybe it should be in the FAQ.
Once there's an answer to this maybe it should be in the FAQ.
I don't really understand that at all. In all the pictures I've seen the scalar ring is outside of the "tube" and at or behind the opening, so how could it possibly affect signal bouncing from the dish face into the tube?
Pictures or diagrams illustrating the effect would be nice.