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You can't explain it because it 100% proves that the Earth is indeed a globe.

Please tell me why these ground stations can only communicate with flying objects when they are within a specific radius and why that radius increases the higher the object is above the ground.

That makes zero sense with a flat Earth model of the Earth. And is a complete debunking of the model.

Now tell me instead why we can do the math to show that the ratio at which an increase in the height of the object and the radius at which it can be detected by a given ground stations scales perfectly with the rate at which the Earth curves. I'm looking forward to your reply.