As ADTech has already stated, signal quality is more important than signal strength.
Improve signal quality by placing the antenna in a location that gives it access to better quality signals. (Consider: If you are trying to record someone speaking, do your get better quality with the microphone in a closet, or in the same room with the person that's speaking?)
The PA-18 is a good option for folks with no strong signals... It's not intended to serve in applications such as yours.
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As an additional troubleshooting step, bypass all those splitters (use F81 couplers) to have a single coax run to TV #3 and see if that helps it any.
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Agreed... a helpful test to determine if any amplification is likely to help your existing configuration.
http://forum.tvfool.com/showthread.php?t=13646