"They don't use wireless energy." Please tell me more about your magical energy-free signal propagation! In all seriousness, Shannon's entropy limit only appl

"They don't use wireless energy." Please tell me more about your magical energy-free signal propagation! In all seriousness, Shannon's entropy limit only applies to a single variable, modulated at a certain frequency. The only reason we apply this limit to radio is because we treat each radio frequency in a given zone as a single variable. In fact, you're perfectly free to use directed antennas or interferometry to establish multiple communication variables on the same frequency. Ah, and indeed, at 1:19, Perlman mentions each cell phone on a separate spatial domain. Since they say it's a single cell phone antenna, I'm guessing we're looking at multiple towers and interferometry between them, possibly taking advantage of the intensity dropoff with distance and timing data for spatial discrimination.