Just to give you an idea on how ratings work and how many homes view the shows each week, here is a basic example from this week.
WWE RAW (4.4 rating) which totals about 3.8 million homes.
Ultimate Fight Night (1.6 rating) which totals about 1.4 million homes.
The Ultimate Fighter (1.3 rating) which totals about 1.1 million homes.
TNA iMPACT on Spike (0.78 rating) which totals about 670,000 homes. Usually the number is rounded up to .8.
The Monday Night replay of Impact on Spike TV at Midnight Eastern time scored a .5 rating.