About this book:

You key the mic, hear the relay click, and a voice answers from 3,000 miles away. It feels like magic—but it’s actually the culmination of a fragile, globe-spanning industrial miracle. *The Last Mile of Spectrum* pulls back the curtain on the hidden supply chain that turns sand and copper into the transceivers, antennas, and test gear sitting in your shack. From the cleanrooms where specialized RF silicon is forged to the small-town machine shops winding custom toroids, this book maps the perilous journey of every critical component. You’ll discover why a single discontinued capacitor can halt a production line, how geopolitical shocks ripple through the coaxial cable market, and why the retailers you trust are fighting a silent war against obsolescence and economies of scale.

But the hardware is only half the story. The spectrum itself is under siege, squeezed by billion-dollar auctions and the insatiable appetite of 5G and satellite constellations, while the community that tends the airwaves faces a demographic cliff. Through deep reporting on manufacturers, distributors, and the innovators racing to keep the hobby viable—from SDR pioneers to hamfest veterans—this book reveals the high-stakes battle to keep the "last mile" of radio open, accessible, and alive. If you’ve ever soldered a joint, chased DX, or wondered how long the lights will stay on at your favorite radio shop, this is the essential history of the infrastructure you depend on every time you call CQ.