Briggs, if you insist on doing it yourself, I would suggest you at least do research for a good RF amp. As Hal said, it is important that the amp has protection against overdriving on both directions. Here's a link:
ChannelVision I've installed the CVT-15PIA and CVT-40BID in several locations, for TW, Cablevision and RCN subscribers. I've had no complaints from customers or providers.
Alternately, you could use this:
CATV Hub I've installed one of those recently (16-port). It is not cheap, but it works. You would also need the CATV Baluns II at the device end. The only thing this setup achieves is that it does away with coax, which may or may not suit you.
