I live in the Detroit area and have Comcast hdtv with a Moto box. I would like to use it to watch hdtv both upstairs and down. What is the best cheap way to do this? Thanks for any help.

The box will only output from one tuner at a time but it should output on all of its interfaces concurently so you can connect one set using component and the other usiing DVI or HDMI.
If might be a lot more convenient to just get a second not PVR digital tuner for upstairs and then you won't have to worry about a long expensive cable run and you wont have to both watch the same channel.