In a major city like Atlanta, Ga you should have no trouble building an audience if your Top 40/Rap or maybe modern pop Cuntry. If your Progressive Rock, Album Rock you have your work cut out for you. Try club houses if you live in an apartment complex that has a club house or has meetings maybe you can get permission to put up a bulletin or give out flyers to advertise your station. Plus those little papers that allow classified ads could help. Many don't know about Internet Radio. Another way is when you go to your cellphone carriers store to pay your bill, mention your station can be received on an android phone and mention XilliaLiveLite or TuneIn Radio if your station is listed there. It helps get the word out. Tell friends and you'll have to do a lot of promoting your own station.
Album Rock stations: Doctors, professors, lawyers, and the elite listen. Go to audiophile Stereo stores you know the places that sell Dennon, Carver, Luxman, Onkyo, and other high end home theater equipment. When your looking at systems mention your Radio station. You may even want to try and get a part time job at an electronics store and look at the people. You can spot a Rocker a mile away. But for other genres you'll have to guess. If you see someone wearing a Pink Floyd shirt for an example you know they love this type of music. Expose your station to the masses.
Have an old car, van? Get it painted with your stations logo and website under the logo or have a plate made. Wear a shirt yourself everywhere you go the public needs to know about your station.
Other than that I don't have any other ideas.
Good Luck.