Splitters
The splitters are passive devices with the common 2 way split sending ideally 50% power down each of the two branches. As they are not ideal and have some internal loss you get about 40% power down each branch.
Having three two way splitters between the entry and the tv brings the signal power down to about 0.4 X 0.4 x 0.4 = .064 or only 6.4% of the original power.
Four way and higher order splitters again just divide the available signal power in addition to suffering some internal loss (AKA insertion loss). Any unused port on a splitter should be terminated with a 75 ohm resistor otherwise some of the inbound power will be reflected back.
Our VIP installer checked the power level at all points of use in the house and made sure that any unused taps were properly terminated. I don't recall if he just did that or if I had to ask.
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