hmmm. Thats the same url i have been using. I have been listening for a little bit today but all i hear is what sounds like someone keying their mike over and over.
The strange thing is that this is not a very quiet airport most of the time while flying there I have trouble even having a break in the chatter to make calls to the tower. A lot of training aircraft all the time. I wonder if this is a feed of 188.6(tower) or their secondary frequency for when they are busy.