For 1 Tv connected use no splitter.
For 2 Tv's connected use a ,
HFS-2D , 2 way splitter.
For 3 Tv's connected use a ,
HFS-3D , 3 way splitter.
For 4 Tv's connected use a ,
HFS-4D , 4 way splitter.
These are power passing splitters that pass power from the power supply/power inserter on the inside of the house to the actual preamplifier that is mounted close to the antennas.
http://www.hollandelectronics.com , also available at ,
http://www.solidsignal.com.