Well, I wouldnt recommend an amplifier for the OPs if using one TV, however if using multiple TVs then amplification further down the coax line can help (classic distribution amp).
Ive also encountered situations where when using one TV, an amplifier in front of the TV(down the coax line) helps. The ultra low noise amplifiers like the KitzTech, especially. (or Verstärker, ReseachComm)
The best amp I have is a Motorola BDA S1 GASFet bi-directional cable modem capable job, spec'd 2
dB noise figure.
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