Is the front of the house to the north?I think if I move another dish closer to the front of my home, I can get a LOS for that bird over that darn hill!
Every foot higher and every foot to the north you go, the more chance you'll have to see over the hill.
I still suggest you get up the north side of the house on a ladder, and do the boresight as Pop described.
Then you'll know by this time tomorrow.
If it looks encouraging, put up the dish.
If you're still looking into the hillside, then it's time for Plan B. *
* not to be confused with Plan Nine from Outer Space !