The FCC doesn't really care unless someone complains about interference. Given that the range of this is so low, the signal is unlikely to even reach your neighbors much less interfere with anything.
Depends on who's the complainer! If it's an enterprise-level business, the FCC is going to storm in. If it's an individual, it's probably going to have to be whoever the mayor of your town points their finger at when they get a call to their hotline. My technician father was on the end of this once - he helped install a wireless water pressure sensor for the water utility and was called 200 miles back to the customer check out why someone was complaining about TV interference. With some radio test equipment, he determined it was... the complainer's electric blanket interfering with their TV!
Yeah, I really wouldn't recommend doing this in a city. Even though the output power probably isn't much, there will be so many spurious emissions and harmonics that you don't know who you'll interfere with.
