How much does height matter?

If I have a perfectly clear LOS to the tower I am subscribed to would I see any benefit to placing the SM up on my roof vs. it’s current placement? Which is on the first floor wall pointing at the tower.

the only height issue I have run into is the ap too high shooting over the sm’s heads. there are formulas to calculate the beamwidth (vertical) to avoid this. the higher gain the antenna the narrower the beamwidth. otherwise, higher seems better in our experience.