I have a WD TV mini media player, an WD Elements 500MB Ex HD and a Dynex switchbox with RF modulator. I have DirecTv which has one coaxial cable from the DirecTv DVR (mdl R15) to the TV. I need to figure out how to connect the media player and DVR using the switchbox without messing up my DirecTv. It doesn't seem to be a complex task but I want to be sure without ruining any of the components, so any help would be greatly appreciated. Thank you