From what I understand, having a Simulcast system only using one tower would be pointless. Using different different tower locations is where the advantages of the simulcast system happens. To decrease RF dead spots over a desired coverage area. So I don't think Barco is the only location. I just might do some research into this as far as the locations of the Simulcast towers and ride around and see if I can figure them out. They should be located on the FCC license though. Have you looked?
