There doesn't seem to be a previous forum on this subject, so I started this one.
Broadcast Auxiliary Stations include Studio-Transmitter Links, Remote Pickup and Relay stations in the VHF band, 25 to 87.5mHz.
Here is a chart of such stations for the DXers who like to search for the signals
http://www.dxinfocentre.com/stl.htm
I skimmed through the Rules Parts 73 and 74 but haven't been able to determine exactly where the specific rules are for this service.
The CB Band from 26.965 - 27.405mHz is not used by the auxiliary stations, but they sure are neighbors.
We have a Part 15 chunk from 26.96 - 27.28mHz (15.227) which shares the very bottom of the CB band, and we are allowed 10,000 microvilts/meter at 3-meters.
This subject came up in the Back Channels, my name for the Part 15 e-mails that get exchanged outside of the forums.
Carl, I have heard the WFLA 25.870 MHz
feed here in CT, plus a bunch of other
ones over the years. It is a great way to
hear a broadcast station that you could
otherwise never hear. (Via radio waves,
anyway - many stations stream of course.)
They are a lot of fun to log.
Bruce, The Dog Radio Group