See, in case 2, a small object a little far away might also block the reception at the horizon angle. The desired angle is not parallel to the ground like is showing in the first pic, it’s slightly going “down”. It meets the local horizon at some miles away.
So raising the antenna slightly more than the immediate objects is still a good thing, if helps minimizing the angle to the horizon.
This of course, if there are such objects far away. In my case, the trees are extending far away from me.
Everything helps in real world.
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