SGC,
Apologies to the OP if it comes across as harsh. I didn't mean to be, and yes, as far as I know, there has never been a prosecution for someone listening in to such transmissions. However, many people are mistaken on this law, a state of affairs to which the sticky in this forum attests.
Regardless, the main variable when listening to 121.6 is the distance the listening station is from the transmitter. What we can hear very clearly on-airport may well seem to a listener 5 miles away as very poor quality.
TCTC, please do feel free to PM me the details, but those responsible would only respond to radio problems that were detectable on-airport. The airport uses 121.6 pretty regularly, and I'm not aware of any reports of adverse quality, but I will check.