we be a Comcast customer and we spend quite a friggin lot for hdtv and other upgrade . but we be experience annoying problem : during we favorite show , it would periodically pixellate , stutter , or even freeze for several seconds . we would end up have to watch on regular non-hd channel -lrb- when possible -rrb- . On-Demand movie download be impossible , they would always crash or do the same thing . and DVR would show would do it , and on some occassion the dvr recording seem to black out -lrb- but we figure out way to get they to `` pop back '' , by start other recording and then switch half-way -rrb- . we have Comcast out several time . they upgrade we cable , assure we it be near 100 % signal into the house , and even check the signal to the tv 's . they even install a amplifier . I swap theirs out and put this one in its place . WOW . we signal even look better and all those issue go away ! one caveat : I notice the Comcast guy use a amplifier and then split off into 3 cable after the single amplify line ! IDIOT !!! I 'll bet if it be a 4-way splitter we would have never have these issue . in any event , this fix the problem . if you be experience similar issue , get this booster . it work great ! finally we be get what we pay all this money for !!!