Stack was the one who agreed with RonJ of 191 miles of curvature.
Tower A is on the east coast and set at sea level and tower B is on the west coast and set at sea level. According to Stack and Ronj, the center of Australia is 191 miles above the base of the towers A and B.
Stack provided the following conclusion.
On a Globe Earth, the center point of Australia would actually be 191 miles above sea level of towers A and B.
And the elevation of Marla, Australia (near central Australia) would be 1076’ above Earth’s circular curve as dedicated. The highest point above the east and west coast waters at center would be 191 miles plus 1076 feet.
In reality, in real life, tower A is on the east coast and set at sea level and tower B is on the west coast and set at sea level.
According to elevation charts and topographical maps the highest point near center Australia that’s above the base of towers of A and B is only 1076 feet and not 191 plus miles Australia does not belong to a Globe Earth. No land mass on this Earth has surface measurements of a sphere. Our Earth has horizontal oceans with landmasses sticking up out of the water.
If Earth were a Ball, elevation points would have to be established above and with Earth’s circular curve at different points for engineering purposes. The worlds languages would include a meaning for a curved horizon, like Curvizon. Our would world be much different.
I know many will not agree, but the conclusion is Globe Earth believers cannot prove Earth's landmass has any curvature because topographical maps and engineering will prove them wrong every day.