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As Neil said, low-power AM enforcement actions are rare, but here is another one that was issued recently:
This one was issued to a college radio station. Interestingly, educational institutions can use the Section 15.221 rules, which allow a school AM station to use any amount of power, provided that that the Part 15.209 field strength limits are met 30 meters outside of all of the border of the campus. Unfortunately, the Part 15.209 limits are so low (corresponding to 2.2 nW from an electrically short antnna), that, unless the campus is larger than Rhode Island, it is not possible to use an antenna to get a useful signal in a significant area of the campus. If a campus uses an antenna (or preferably multiple transmitter and antenna combinations) it is much better to use Section 15.219 rules rather than Section 15.221 rules. LPB lobbied for for Section 15.221, and got it in 1990. But it did not help them sell many transmitters with antennas at schools. Section 15.221 also permits the use of buried leaky coax cable, and LPB was able to sell some buried leaky coax installations, such as at Disney World.
The field stength measured at the college charged in this particular NOUO corresponds to a radiated RF power from an electrically short antenna of 469 mW. This clearly exceeds Section 15.219 limits, since the input power that is allowed by Section 15.219(a) is only 100 mW, and the antenna length limit of Section 15.219(b) results in an astonisingly low radiated power (even if there is cheating), as I showed in another post in this thread.