I buy this because I have pixel , freeze , and channel dropout on my Suddenlink cable when they add a whole tier of hd channel . also I have my internet only work at 1mb per sec down and up . I have 2 hdtv 's and one sdtv , plus cable modem split from my mainline . I plug they each into the amp and add the a 25 ft coax run from the nearest electric in the attic . this take five minute to install and my internet be now 10mb per sec down and all the tv 's be clear .