This is the second unit I have installed. One for my home and recently for my in-laws. Takes the SKY HDMI output and modulates it into a digital RF signal that sends HDMI quality signal out to the other TVs in your house via your COAX aerial cabling. You tune your TVs into the modulated digital channel, defaults to channel 800, and you have the high quality SKY output. Note there is also a model that supports infra red "IR" remote control relay back to you central SKY box so you can also change the SKY channels remotely (I did not need that as they had a wireless IR system installed so already had remote control over the SKY box). You...view more