You have a website right, your website is not only an electronic page online it is pretty much alive. When someone visits your website in only few seconds they receive a lot a messages, from the shape, colors, images, tittles etc. Your website is the face of your internet radio station; this should talk too giving the message to the visitor of what your station is about. Your visitors will be interested in tuning in to listen to what you have to say. Use your website to attract listeners publishing news, articles or opinions about some theme you know will be of the interest of your visitors.
Also use your website as a compliment to your Online Radio Station to give more information. For example you can talk about something very brief and tells the audience “hey if you want to know more check our site for more information” or you can have a debate/survey using your website. Like this you will have traffic to your website and have more content to attract potential listeners.
Make your website “moron proof” of as simple as possible, do not let your website visitors figure out how to do thing on your site, tell them what to do, how? Again make it simple and obvious.
Things you can add to your website or things you can do with your website in cooperation with your online radio station:
Remember your website is working for you 24/7 attracting potential listeners you need to work on this too.