Comment by tjohns
It would be under the FCC regs, not the FAA regs.
Whatever transmitter you're using would not be type-accepted for operation on the 1080 MHz or 978 MHz band. (47 USC § 301)
Additionally, RF operation with the intent of willful interference is inherently illegal. (47 USC § 333)
What if you removed a genuine ADS-B unit from a plane and installed it in your vehicle?
Also does impersonation necessarily qualify as interference? Naively, I'd expect interference to refer to jamming.