But the TV model has the same programming in essentially every market in the country. If you buy a spot in NCIS, you get comparable reach and demos in every market because the content is the same.You don't have to own stations in every market to be able to sell in every market. The network TV model shows that.
But in radio, when you add "sales affiliates" that don't have the same precise format and demographics; you don't have the situation that has kept radio viable in other countries but not the U.S.
This is what has traditionally been called an "unwired network" which is an amalgamation of stations that are not identical.What people don't see are the sales networks that exist that are based strictly on demos, not formats.
And that means that in every market, the "network" reaches different kinds of people based on different formats. There is no way to reach, let's say, the AC listener with their specific characteristics with one buy that covers at least 90% of the nation's market population.
The current situation is what makes media directors and media planners leave radio off of buys more and more.