FM Ishigaki is one of the very first pure Japanese music based radio station that was created with the intention to broadcast to promote the Japanese music of their culture throughout the whole world. They are now one of the very first and also one of the most popular radio station that is known for Japanese music.
FM Ishigaki official website address is www.fmishigaki.jp
If the Radio is extremely choppy and stops every 5 seconds, try listen to this Radio at different time.
Not all Radio Stations function for 24 hours everyday. If you can't listen to any Radio, try to listen at different time, as the Radio Station may stop during midnight according to its own country time zone.