Those McCain 'weekly radio addresses': What about equal time?

[Newsjock]

Are any actual, real radio stations airing these "weekly radio addresses" that always manage to dominate the Saturday news cycles?
If so, what stations?
And if so, are they running as paid advertisements, or as "news" events?
If the former, who is paying for them?
If the latter, why doesn't the Obama campaign get an equal amount of time?

[bluestateguy]

1. If he pays for the time, then no equal time is required

If the stations are giving him the time for free to make uninterrupted monologues then I believe they would have to give equal time IF it is requested. I'm not aware that that has happened.