Your m3u8 file looks very strange. I've not heard of the #EXTMP4 and #EXT-X-ENDLISTC tags, and in any case you have no media URI specified anywhere in the file. The #EXTINF:10,ttp://skyscape.sky.com/skynewsradio/RADIO/news.mp3 tag merely specifies the duration and title of the media segment, not its actual location, which must be specified on a separate line, e.g.:
#EXTM3U
#EXTINF:-1,http://skyscape.sky.com/skynewsradio/RADIO/news.mp3
http://skyscape.sky.com/skynewsradio/RADIO/news.mp3
The above m3u8 will play on media players such as VLC, but I doubt it will play on the Roku, since the Roku m3u8 playlists are intended to play video HLS streams, not mp3 audio streams. As RokuChris said, you'd have better luck using the roAudioPlayer component to play it.