Keep Detroit in the Top 10.
The rankings are for MSAs (Metro Survey Areas).
Metro Areas a defined by the Census Bureau and definitions are subject to change, sometimes as a result of political pressure and influence.
Get the Census Bureau (and therefore Arbitron) to include Washtenaw County in the Detroit Metro Area.
Currently it's the Ann Arbor Metro Area (including only Washtenaw County) - Market 147 with 297,100 people 12 or older.
That's more than enough to put Detroit ahead of Atlanta and Washington, making Detroit the number eight market with Detroit radio getting all those extra bucks that go to stations in the top 10 markets.
Check the Ann Arbor ratings. They mostly listen to Detroit radio anyway. Based on radio usage, and not all the other factors the Census Bureau uses, it should be in the Detroit market anyway.
The other alternatives are:
Get people to move back.
You may get some broadcasters out there in Ann Arbor fighting to stay OUT
of the Detroit Metro Area. To be lumped in with Detroit would put them at a disadvantage financially. When Lee Hanson owned his stations in Port Huron (St. Clair County), they too were part of the Detroit Metro. Lee wanted OUT
of Detroit. The reason? Because when your stations are lumped in with the other signals downriver, and you don't show up in their book, that's agency money you're not getting.
This is why stations that are in a major market, but are not major market themselves per se, usually struggle financially. When you're in a non-rated market, then the diaries sent out to listeners in your area aren't lumped in with the adjoining major market.
This is one reason why a lot of high-powered FM's in that same situation market themselves towards the city, and not the suburbs. They have to depend on that agency money to survive. The electric bill alone for a 50kw FM will kill you.