To my knowledge, RV manufacturers are not yet wiring for HDMI. Quest has promised a new product which will feature HDMI inputs, but will probably still transmit the signal to the TVs via Co-Ax. This is not a bad thing, mind you, as co-ax cable is more than capable of carrying HD quality video. Again, it is the switch box itself that is the cause of signal loss, not the cables. There are only two manufacturers making a switch for RV installations, and both are antiquated designs which cause excessive signal loss. It will be up to the RV manufacturers *and* consumers to...encourage...them to stop living off the profits of their old product and put some money into updating their product designs to eliminate the signal loss.
I should also add the reason the signals must be carried to the TVs via co-ax is the Antenna, as well as Cable/Sat Set Top Boxes that use co-ax not HDMI to connect. In both cases the TV's tuner must be used to select the channel you will watch (Antenna) or tune to for the STB (Chnl 3 or 4 usually). Same is true for the DVD. The switch box is a great idea for an RV as it simplifies the cabling from one set of input devices to multiple TV locations. Its the design of these switch boxes that must be improved. Not many campers use a STB for cable unless they are permanent residents, and rely on the campground's service so again, the TV tuner must be used to select the channel they watch.
