Whenever I have visited big metropolitan areas, I have created favorites lists with the specific services I wanted to monitor, then I chose a single site to monitor from. In other words, I did not give the scanner multiple tower sites but I forced it to use only one tower site. I have done this with systems in Minneapolis, MN and New Orleans, LA with a Home Patrol 1 and a RS Pro-668. As far as I could tell, the multi-site problem was solved and I was able to monitor those metro areas beautifully.