Not all TV's have the same sensitivity on the input stage.
If the splitter you have is a passive resistive type then your problem can be solved by installing a masthead amplifier to increase the signal level from the antenna.There are some with fixed gain,some with switchable fixed gain,and others with continuously variable gain via a pot.I'd try and get one that has at least 9dB of gain to start with.Masthead amplifiers are relatively cheap and access is needed to the antenna to install the amplifier box.
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Last edited by TWT; 11th May 2015 at 06:40.