Input on upgrading the entertainment system

There are devices that can comnie a sat signal and cable/ant signal onto a single coax. They look just like a cable splitter but work on different frequecy's. Should be able to pick them up at radio shack or somewhere that sells sat equipment (or online) Called a diplexer. As for your HDMI signals there is nothing you can do to "convert" these. HDMI from a blue-ray or sat/cable box is encriped with what is called HDCP which is essentially holloywood copy protection. ANytime content is "HDCP encripted" (Basically all blueray movies and content from sat/cable) each device in the line must be HDCP compliant or the system will not work. For that reason there are no HDMI to RCA converters that will pass a blueray signal for example. What you need is something that can act as a Matrix switch either hard wired or wireless. There are some better quality wireless solutions that will work but are much more expensive then what you see at Cosco. Company called Intelix for example has a wireless HDMI system where you buy the transmitter and the reciever seperate and can have up to 4 recievers off each transmitter. You may want to look into hoe theater receivers that have "multi zone" video capability and HDMI switching. This would allow you to route your HDMI signal to multiple locations (how ever many zones the receiver offers. Typically 2 but sometimes 3) and would give you the better surround receiver you are looking for for the main area. Hope that was not too confusing. HDMI to be honest is a total pain in the rear end. People think its great because of single connection until you try doing anything other than point to point. I suggest finding a local home theater shop that has knowledgeable people and ask them to help you. good luck!