residential/apartment?
Can you put the dish on a second floor balcony?
We have had some discussions of shooting through a south-facing window, and I'd refer you to those threads for more info.
If your 2nd floor location does not have a clear shot to the 97 bird, may I suggest running down to the ground to mount the dish, or some other non-roof location?
It wasn't clear if you were suggesting running a coax all the way down the building, but I would not even consider it.