I have a cable splitter in my house, a passive one, currently feeding 3 sets. I'd like to be able to feed one or two more, and I'm sure the first three are already suffering from the split, so I thought adding some sort fo line amp would be the way to go. But I had some questions: 1) It seems like radioshack carries one of these, but the amplifier level is not variable. I come from an audio background and wonder immediately about the potential to OVER amplify a signal. Are these things automatically regulated? Do they just guess and hope the signal doesn't clip? 2) It seems radioshack also has one that does offer a gain adjustment- is this a better idea? Is variable gain necessary- or is it usually ok with a fixed boost? 3) Is there another source for these other than Radio Shack. I don't mind cehap- this is not overly critical- just trying to keep from getting a ton of noise in the line from hooking up to 5 TVs. Anyone have any advice on these things?