very easy actually. go to the tune in radio station you are looking for and right click and go to view source.
Hot Hip Hop
(in chrome)
view-source:http://tunein.com/radio/Hot-Hip-Hop-s273492/
search for “StreamUrl”
gives you this
Copy that to your address bar
This will output the following string
“{ “Streams”: [{“StreamId”:73770218,“Reliability”:78,“Bandwidth”:192,“HasPlaylist”:false,“MediaType”: “MP3”,“Url”: “http://rfcmedia.streamguys1.com/hothiphop.mp3","Type”: “Live”},{“StreamId”:73770219,“Reliability”:99,“Bandwidth”:96,“HasPlaylist”:false,“MediaType”: “AAC”,“Url”: “http://rfcmedia.streamguys1.com/hothiphop.aac","Type”: “Live”}] }”
This is your URL. For certain devices like chromecast you may need to include the container.