Let the listeners create your TV spot
I’ve said this before and I’ll say it again: If you want to do TV but don’t have the bucks for production and you have a loyal, fanatical audience, let them do the work for you.
In fact, even if you don’t want to do TV, let the audience create some spots then showcase them on your website.
Let the users advertise the station for you.
Just like Apple does with its iPods in this fan-produced spot.