Well, sort of.
I want to broadcast an FM radio signal playing MP3 files in a variety of
buildings from single story homes to multistoried buildings.
Small dwellings are no problems but the larger ones present a problem. The
location of the broadcast unit may be mandated by factors beyond my control.
The power needed to reach the opposite corner might be to high.
Is there any way to use internal wiring as a short range antenna that would
be limited to the building for all practical purposes.

Another possible solution that I can't find an answer to would be to put the
signal on an unused TV channel if the building is wired for cable.

I've done a lot of Google searching but can't find anything specific.

Thanks.