I am after some advice on the best way of splitting a signal whilst maintaing signal strength. I currently have the aerial in the loft running to cheap two way splitter in the loft. At the moment this feed only runs to one TV which give me a reception strength of about 7/8 and quality of 6/7/8. However as soon as i send a second signal the reception strength remains the same, but the quality drops to 3/4/5. I have tried a booster which doesnt really work and other comments on this forum suggest they are not much good anyway. That leave me with the possibility of a masterhead amplifier..but these seem to need a power source. How are they powered when they should be near the tv aerial...which in my case is in the loft?