For 1 Tv connected a amplifier is not required. For 2 Tv's connected use a Channel Master CM3412 distribution amplifier , For 3 or 4 Tv's connected use a CM3414 distribution amplifier.
http://www.channelmasterstore.com . The Tv/s Must scan for the Digital Broadcast Tv Channels sometimes named the 'Antenna Channels or 'Air channels in the Tv set up menu because the Tv transmissions travel through the air from the transmitting antenna to your receiving antenna. Do Not scan for cable Tv channels.