OOH is one of the few channels left, so how are you handling it across state lines?

Being shut out of most paid digital makes out of home one of the only channels genuinely open to us, but the rules are state by state and so is every media owner. Operating in more than one state, I want to know if there's a way to plan and buy centrally instead of starting over in each market. Reporting I can show investors matters too. How are multi-state operators doing this?