> Actually, just being in possession of such a device in the US isn't legal.

Wait, SDR devices are not legal in the US? That doesn't sound plausible.

My "computerized legal advisor" says:

> There’s no rule from the Federal Communications Commission (FCC) that forbids individuals or hobbyists from buying, importing, or owning SDR hardware in the United States. You can legally purchase and have them.

> Radios that transmit need FCC equipment authorization (such as certification or Supplier’s Declaration of Conformity) before they can be marketed in the U.S. if they are capable of operating in ways that could cause interference. That’s primarily a manufacturer obligation, not something that restricts private ownership.

> Owning a device is fine, but you must not transmit illegally. Sending signals on unauthorized frequencies or at unauthorized power levels can lead to fines, equipment seizure, and other penalties.

As with so many other things, intent matters.

Owning lockpicks? Fine!

Owning lockpicks when you're caught burgling a house? You're extra screwed.

Owning an SDR? Fine!

Owning an SDR and getting caught using it to illegally disrupt communications? You're extra screwed.

Yes, you can absolutely own an SDR, and transmit with it on legal frequencies. If you're busted using it to break the law, then it's strong evidence that you went out of your way to deliberately, premeditatedly break it, and that makes for a bad day.