Hi Johannes,
I raised a similar discussion a few years ago. My conclusion was that for a vertical antenna on 2m FM the higher that you can get it, the better. The true height above RF ground is unknown on a real summit. The tilting effect of gradients and sharp edges are difficult to model. The higher that you go the more lobes are created and if you are unlucky you may end up with a deep null on your preferred signal path. But overall, the higher the better is my takeaway .
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