The radio spectrum is a finite, invisible resource where submarines, Wi-Fi, and satellites compete for space. This episode maps the entire frequency ladder—from VLF waves kilometers long to oxygen-absorbing V-band signals—to reveal the physics that keep our wireless world from collapsing into chaos. Learn why AM radio is the resilience king, how Bluetooth avoids Wi-Fi traffic, and why Starlink needs to speak in "rain-fading" frequencies.