I have an Intel iMac that I would like to watch HD and SD TV on. I have a Dish TV satellite cable coming into the room that is the #2 Output from a receiver in another room. Dish lets you control that output with a remote that is RF to the receiver. So I have a cable and the ability to change channels from the hand held remote. How can I get the cable into the iMac? THe cable is the standard 59U (?) Sorry if this is a newbie question. Any help would be appreciated.