Implementing a passive signal 4-way splitter will technically attenuate the signal.
This might affect the picture quality negatively when:
- The source (antenna) signal is too low
- You are using long runs of coaxial cable
Install an RF signal amplifier in front of the signal splitter, preferably close to the source.
This will ensure the fixed attenuation of the splitter (-7.4 dB) has no effect on the signal quality of the outputs.
Note: the attenuation does not depend on whether there is 1, 2, 3, or 4 outputs connected.