I still can't believe I'm having issues with this- really, this is maddening- but I am. I obtained the Ideal #85-132 splitter and installed it. There was a minor improvement: instead of losing 15+ channels on the first line, I only lose one or two. However, the second line is still DOA.
I think I know what you will say next: move it outside.
This can indeed be done, but with the all effort and expense that it will take to do this, I want to be absolutely sure that I have exhausted all other options. So, once again, any ideas?