35.18MHz simplex used to be used by the Niles Flash Cab Association (Niles being a northern suburb of Chicago) until they went with CAD, when the channel went down to zero use. Recently I became curious if the frequency had been recycled by another user so I started scanning it again; after a while I heard some kind of signal barely breaking squelch. Maybe digital, but I can't get it strongly enough to ID it. Has anyone had better luck at hearing & IDing something? (I doubt it's unofficial comm between cabs since none of the cars I've seen have retained an antenna...)