Unfortunately, much of my antenna lines is relatively old and Dia concealed. Entspechend bad was the reception of HD channels on the second and third devices. Dropouts and pixelated images were the consequence. I would like to say that I am a customer of Kabel BW. I had already tried some inexpensive antenna amplifiers that have all but brought no improvement. But because I wanted to lay any new cables, I have again a try with the 'Hama 4x Verteilverstärke' daring. I have connected the device, all the individual units with the amplifier connected us what can I say, my problems were gone. Although I had on the existing regulator damping adjust a little, but then I had to any device a super image and even with HD channels. I am absolutely thrilled. If each output could be controlled separately, the amplifier would be even better. But I will not complain, after all, I have spared the Hama amplifier an extensive rewiring. From me there is an absolute buy recommendation.