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.