b) is not legal, people have gotten fined for interfering with RF signals on their own property (e.g. stores, restaurants etc). People interfering with GPS or c

b) is not legal, people have gotten fined for interfering with RF signals on their own property (e.g. stores, restaurants etc). People interfering with GPS or cellular on their own property is also common and highly illegal, and I assume the same laws would apply to wifi. Problem is you can't stop RF propagating off your property lines in that scenario, and noise jamming in the wifi bands can effect other more sensitive equipment that operate in the same bands. But like most things FCC related, you can likely get away with it if you aren't egregious. a) I've never been quite sure. People do testing in Faraday cages so there has to be some exception. I'm pretty sure as long as you aren't interfering externally and are being responsible nobody is gonna fine you.