I downloaded Dead Money shortly after its release, and figured I'd just keep leveling my character while completing more quests and the like. Eventually, I decided to finally complete the Dead Money campaign, and when looking at my radio stations, saw nothing pertaining to Sierra Madre. I used the Googles to see if there was a certain area I'm supposed to be in to activate the signal, but have found nothing useful. I have found the Abandoned BoS Bunker, gone inside, and still no radio. I am level 34 now, so I know the DLC was downloaded.

If anyone could help me at all, or provide any kind of information, I would really appreciate it.

I'm not sure about this, but try deleting the DLC, reinstalling it, and play on a new character until the "Dead Money has been loaded" message pops up. Hope this helps.

The new patch disables all DLC. Leave to Bethesda to make the game more bugged. :facepalm: