We digitally reconstructed Tesla's magnifying transmitter from his patents and Colorado Springs notes, modeled the EM fields, and found something nobody's published before.

Key findings:

• Marconi's 1901 transatlantic signal traveled via ground wave, not skywave — Tesla was right, textbooks have been wrong for 125 years • Tesla's "longitudinal waves" aren't pseudoscience — they're TM₀ guided modes in the Earth-ionosphere waveguide with a longitudinal E-field component • Full Wardenclyffe reconstruction shows it would have worked as a global VLF comm system • You can build a modern version for ~$2,000

20 experiments, 47 plots, Python, peer-reviewable paper included. arXiv submission pending.