You need a coaxial to HDMI converter. There's a picture of one on this Image link.
https://www.google.com/search?q=coaxial+to+hdmi+converter&aq=1&um=1&ie=UTF-8&hl=en&tbm=isch&source=og&sa=N&tab=wi&ei=mQh1Ua_hEev4igL4nYCQDA&biw=1081&bih=640&sei=oAh1UbvULuHtiwKZ4IGwCg#imgrc=9zoUUlLv4ytTrM%3A%3Bhik346_V8tTtyM%3Bhttp%253A%252F%252Fcdn.head-fi.org%252F7%252F76%252F767d5952_stock-photo-3113074-hdmi-and-coaxial-cables.jpeg%3Bhttp%253A%252F%252Fwww.head-fi.org%252Ft%252F507559%252Flist-of-dacs-that-work-with-ipad%252F390%3B380%3B253