To have good picture quality you need zero DB (decibels) for one TV without a splitter. You can use and inline amplifier for each individual TV hooked up to the cable input with a output leg connected to each TV. If your house in wired in parallel (one main input hooked up to a splitter with all of the other TV's run off of the splitter) you can use a whole house amplifier hooked up inline between the input line and the splitter. If you house is wired in series (the input goes to the first outlet, then splitter to second outlet and so forth) each splitter knocks your signal levels down 50% each splitter. Amplifier placement depends on how the home is wired and how many TV's are in the home. Splitters can be either balanced (50/50 split) or imbalanced (75/25) etc. On a two way splitter 75% of the signal goes out one leg, while 25% goes out the other (usually for FM transmissions). If you have a three way splitter the signal is divided by the number of output legs. Splitters do go bad as well (sometimes only one leg). You can also buy an amp that is multi- port (which splits the signal and amplifies in one unit/ one input and 2,3,4 outputs). Amplifiers are electric and there is no way that the splitter can interrupt the power that would take all the signal away. If you meant that it drops the signal level so the picture is unacceptable, that's different. If you have another splitter in the house try using that one, the other might be bad. All in all you can purchase most anything you need at a Radio Shack and are very inexpensive. Amps can be purchased in different gains (boost). +10db, etc. I cannot believe that your cable company is giving you such minimal signal that 1. you need an amp?, and 2. that one splitter drops your picture to nothing? Your line extenders (amps for the lines that feed your neighborhood) might have problems or need adjustment by the lazy, cheap, cable co. also. I had problems with my cable company (when I had one) my modem would not stay online. 4 months later, they diagnosed the problem and my drop (RG56 cable line that feeds my home from their tap in the cable box outside) was bad. My friend could stay online and 2 months later comcast adjusted their amps (line extenders) in the neighborhood and then he was fine. I know this is a lot to digest, but I'm just trying to draw a clear picture so you can understand it all. I hope this helps and good luck!