Yes, very illegal.  Which makes me remember to ask: how did Todd Humphreys get permission to transmit a spoofed signal [1] in the middle of a thriving metropolis, within a couple of miles of an airport?<p>[1]<a href="http:&#x2F;&#x2F;alcalde.texasexes.org&#x2F;2012&#x2F;06&#x2F;ut-demo-reveals-drones-vulnerable-to-gps-hijacking&#x2F;" rel="nofollow">http:&#x2F;&#x2F;alcalde.texasexes.org&#x2F;2012&#x2F;06&#x2F;ut-demo-reveals-drones-...</a>