Commercial Auctions When You Make A Tv Commercial What Does The Local Tv Station Do With It When You Don't Use It Anymore?

When you make a tv commercial what does the local tv station do with it when you don't use it anymore? - commercial auctions

My grandfather owned a butcher shop in Detroit from 1969 to 1989 and has made several announcements at the show in 1970 to the old theater and the auction WGPR world, which aired on CBS 62 are now in Detroit, but in the 70s WGPR black TV channel. I'm trying to have its business only on a memory She tells me they are killed, but I do not know how the ads.