Sorry, I have two questions actually:

1. Where is a good place to put the radio station object? I'm not adding any accessible building / radio tower at all.

2. How is it that I've seen FO3 radio station mods that can use stereo mp3s? The GECK wiki says that the songs must be .wav files in mono sound.

1) I recommmend you to create your own interior cell and place the talking activator. Have broadcast to "Everywhere" and player will receive signal via pipboy regardless of current location.

2) If I remember correctly, .wav files are for player who listens radio through pip-boy. Some radio stations can be turned on by radios (ex: Prospector Saloon has 1 radio that broadcast New Vegas Radio)

and those ones require .mp3 files. But i'm not 100% sure on this.