But the issue through that gap, 160' (across the street) away there is a pretty tall tree that causes LOS issues. And that tree is pretty much smack in the middle of the gap that we would need to point to in the first place.
Go to the site dishpointer.com and put your location (even if its just somewhere in town) choose the 99, 101, and 103 sats. They have an option to figure out what distance an item that is in the LOS and how much clearance you need to overcome an obstacle at a given height. The reference will be from the ground so dont forget to compensate the height at which its mounted like 20' up on the roof of house.
You will find that at 160' out you can only clear about a 30' object, on the roof maybe you clear 50'. Do you know how tall the tree is now, not to mention how much taller it will get? Even if you go to the as far back in your yard you still may not clear it.
A simple clinometer LOS tool if you have an iphone is to get an app like the carpenter ones that show the angle at which the phone is tilted. Make sure you calibrate it for approx level like from a wall in your house that you know is level. Then add something that is straight like a ruler to the long edge of the phone, if you want put a small loop on the end of the ruler like to make like a target sight. Now take the phone around with a mirror so you can see the angle or get someone to watch it and tell you when the angle says 9-10 degrees. When you look through the sight you will see the obstacles in your LOS.