I trying to design a radio system that will allow our company's fleet to keep in touch through radio over as great a distance as possible. I am looking at business band which I believe would be running on vhf signals...We would have several vehicles set up with larger antenna's and mounted radios. I think 75 watts is what available, maybe? What kind of distance between vehicles could one really expect to get? Is there a better system to accomplish this? I am trying to understand radio powers and legal restrictions. Any recommendations on businesses that could design something for me or a reference site?