I would suggest distributing the A/V signals like Robert Suggested. The problem with distributing the A/V signals with the Radio Shack piece is that the audio is sent out line level and the video is being sent out base band. The problem is you will have to run separate audio L+R and separate video cables to each TV. If you simply modulate the signal like Robert suggested you will minimize the amount of wiring and you will be able to use the existing coax to each room. This is the best way to do it for the money. The A/V signals can look very good if you use the right modulator. We use the (Blonder Tongue Laboratories Inc.) model HAVM-2 series. You can connect any 2 sources and any combination of A/V equipment to it to be distributed to as many TVís as you like. Whether you have cable or a local antenna use a backwards 2 way splitter to insert the input of both the out of the modulator and the cable or antenna into the 2 way splitter, then from there go out of the, since itís backwards it will be the in part of the splitter. From there go to the splitter that is distributing all of the other TVís in the house.
Good luck Greg Brown Entertainment Technologies Dallas TX