To use the second television in another room also the benefits of HD-Box, the signal on 25 meters had to be transported.
The structure looks like this: a player device (DVB-C box, hard disk recorders, Blue Ray player) - 2 meter cable - Yamaha amplifier with 2 HDMI outputs - 15 meter cable - Repeater - 2 meter cable - switch box - 5 meters of cable - TV.
Without repeaters arrived only the signal of the box with disturbances. With all signal repeater clean (no additional power supply) and without interference.
Just do it the eighth also be connected on the right side of the cable. So on input of the cable source and output on the recipient's .... otherwise not much doing with reinforcement ;-)