Power boost Antenna

[old_tv_nut]

A splitter always reduces the signal power to the outputs. This occurs whether the antenna is a powered one or not.

The concerns with your arrangement are:
1) if the splitter blocks DC, your power antenna won't get power (apparently your splitter doesn't block DC, if the power antenna is working)
2) if the splitter passes DC but has resistive elements, it may reduce the power to your antenna
3) if the splitter passes DC between all outputs and the input, it will reduce or short out the power to the antenna if anything on any output shorts out DC.

Best way to be sure none of this happens is to interchange the positions of the power supply and the splitter in your diagram. "Power to antenna" block should go between "splitter in" and antenna. The "power to antenna" device sends DC only on the antenna side and will not put DC on the splitter and TV sets.