Re: Is listening illegal? Not unless the law says so...
"..commercial..gain..." is a factor in the statute to be considered when determining criminality.
The Chocolate Factory stepped over my property line, got unique identification data from my equipment, then used it to make money.
Their only defense is that I was "broadcasting" to the "general public"? How many of them can I get in front of my house? How "off the shelf" is the hardware and application to glean this data?