Might have to look at splitting the SKY as per JAXSON's notes. I see that the Sat decoder has only one dish input
Probably your best option. Don't know if MySky has a LNB out socket but the $89.95 box from the Freeview Shop has LNB loop through so you don't need a splitter. Just plug Coax into STB and out again to MySky or vice versa?