In clear English, and a minimum of math, this booklet details Tesla’s radical radio technology. Early elemental radio devices, like Tesla’s and others shown here are fascinating because they remind us how powerful radio technologies can be so simple and accessible. Modern radio took a lot from Testa, but what did it ignore? Tesla’s high-voltage, sudden-pulse disturbances of low frequency conduct over distance as effectively as through copper wire. His wireless power works on the very same principles. Also, spark reconsidered, grounding rediscovered, low frequency revived, lament on solid stale, underground radio, license-free radio, the suppression of amateur radio, carrier current radio, radio-free energy. Who owns the ether? 66 illustrations.