I do not know what shape the earth is... but i can say that the ball of earth, ball earth has been disproven.
For me, a theory, in order to work has to allow for "inner earth"... or the other side. Too many stories of it.
We also need to discuss the electrical characteristics of earth... and this will need the understanding of how the aether is structured.
RE: Why the Shape of the Earth Matters. About Tesla's Tower.