What people don't realize is the tower portion did not radiate radio waves. The round knob at the top of the tower actually is to prevent radio or any other kind of energy from leaving the tower because the energy is directed into the Earth where it resonates within the Earth and can be picked up anywhere around the earth. That was Tesla's power system. You want to have a round knob on the top to prevent sparking into the things. In fact when a Tesla coil is properly used it does not put out Sparks or anything at the top of the tower. People who are running Tesla coils and producing those large Sparks and other things that you see I actually writing them incorrectly and they're overpowering them and causing a breakdown at the top of the shiny knob. The reason the knob has to be around is if you don't have any sharp edges and it's harder for the energy to escape.