The Original Old-Time Radio BBS

I was wondering if there are any Big Band Radio Shows/episodes Broadcast from Iowa?

I beleive Glenn Miller was born in Iowa.
And there is an episode from his show that was broadcast from Des Moines around July of 1940.
But it seems this episode not available to the public because I haven't been able to find it.

Thanks for any help.

Some an interesting info about Glenn Miller's Birthplaec in Iowa.

http://www.glennmiller.org