The Converter boxes are sold at any electronic's store for over the air digital they run around $30 dlls or less and any FTA reciver that you might have will work all you need to do is find the sat using lyngsat.com for the Japanese channels here is the link to point at the Japanese station click on the Asia-Pacific lyngsat
Asia & Pacific - LyngSat
https://preferredbypete.com/dishes-lnbs/16357-satellites-around-world.html
Asia & Pacific - LyngSat
https://preferredbypete.com/dishes-lnbs/16357-satellites-around-world.html