I recommend Holland Electronics splitters.
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.
http://www.hollandelectronics.com ,
http://www.solidsignal.com.
The Tv/s Must scan for the Broadcast Tv Channels sometimes named the 'Air Channels' or ' Antenna Channels' in the Tv setup menu because the Tv transmissions travel through the air from the transmitting antenna to the receiving antenna.
Do Not scan for cable Tv channels.