How far into the room (away from the windows) do you loose sight of the bus stop? I know that that would depend on where along the front wall one is. So lets specify along a perpendicular line to the front wall at that runs to the back of the end of the couch seat closest to the front wall. I believe that the angle to the right edge of the window nearest the TV from that spot is very close to the angle to the bus stop. Also, do we know the bus stop was at the same exact location in 1963 as it is now?
This is so typical for you. You clearly have never been to the rooming house yourself, yet you "believe" that Roberts was sitting on the couch when Oswald walked out. Why do you believe that? The answer is simple; so you can argue that she would have had a good look at Oswald as he walked out. You now have two people, who have actually been there, telling you that she couldn't have seen the bus stop from the couch, yet instead of accepting that, you are still desperately looking for a way to keep Roberts on the couch anyway. This happens all the time with you. You prefer what you believe over factual information time after time.
Well, let me tell you this; if you are now looking for a way to place Roberts on the couch seat closest to the front wall, so that she could somehow see the bus stop, the consequence is that you put Roberts on the couch at a location where Oswald would have passed behind her on his way to the front door.
You really need to think things through in the future.....