“This was very expensive, controlled technology a decade ago, but today a motivated hobbyist can pull it together using open source software and hardware with a few hundred dollars,”
This is a repeated mistake made by manufacturers of radio spectrum devices, relying on expense and availability as a supposed form of security. Spread spectrum and frequency hopping are easily countered with cheap SDR dongles. Likewise, the recent hacks on emergency sirens, demonstrate this is not a reasonable approach to security.
