Well, I show in my notes 463.950/115 DPL as a frequency for the Colony, but I don't think I ever confirmed it as their security frequency. Their license for that freq, WNGJ496, is expired now, so they may or may not still be using it.
A 1-mile-radius search around the coordinates of that expired license doesn't show any other licenses.
Sorry I can't offer more help than that.