Yes, you can only hear one at a time on your scanner. In the past, and even today, I will hear a transmission on a certain TG and hit the scan button on my scanner and I could easily hear the same person talking on up to 4 sites. If that radio is the only radio on that TG then I guess there would be no need to use all those sites. I get that. I was just trying to let the person know that you can hear the same radio transmission on multiple sites. If I remember he was programming the voice channels individually and not using the control channels to properly "track" the users. I might be wrong with that assumption.