Yes B, that's a very good question. will try to answer you!
As you saw in the video, it's at the Rx coil, so that assumes our good old earth which provides this capacitance (which I consider real), is between the top of TC and allows the current to enter from the bottom, with the voltage hot point or anti node at the top and the current node at the bottom(node point), like in Tesla's diagram of capacitances. When the transmission speed of the Tx coil is close to one, at the Rx coil the Tesla effect occurs. I've tried different arrangements, and it works as Tesla described. Remember TEM must be lower as possible, it is not inductive transmission of energy.
Spigel demonstrated that by placing the load at the bottom of the TC, the current actually comes from our good old earth. Nikola Tesla explains it a bit, but in different patents. The first time I saw this, I asked myself the same question as you. I tried it, and it works exactly as Spigel demonstrated.
In my upcoming video, which I haven't had time to finish, I also demonstrate this by connecting the load to the bottom with connection at the base and without connection at the top just by a capacitive effect.
Jagau
What we consider to be empty space is merely a manifestation of unawakened matter. N.T.