I would like to know if a product exists that can help in the following situation:
We are building a new house.  We have 8 rooms that will have a TV. 
They currently have a single coax wire as a home run to the basement. 
We would like ot get both Dish Network and DirectTV International
programming as well as our local Comcast Cable.  There are 2 Coax home
runs to the roof from the basement.  Is it possible for all 8 rooms to
get all three signals?  I know there is a way to combine Satellite and
Cable into a single coax (using a diplexer), but is it possible to
combine 2 satellite signals (DirecTV and Dish Network) and cable onto
one coax?  What is the equipment required at each end - the roof, the
basement and at each of the TVs?