If you will like to receive more reliable and more Digital Broadcast Tv stations/channels.
Above the Peak Of The Roof in such a manner that the roof and house are not blocking reception to the , east , south east , south , north and a little east.
Install a Winegard HD7694P antenna aimed at about 140 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Here are some above the roof antenna mounts.
http://www.ronard.com/909911.html. use the 5 foot tripod antenna mount.
http://www.ronard.com/34424560.html , use the #4560 eave antenna mount.
http://www.ronard.com/ychim.html.
http://www.ronard.com.
Buy the ronard antenna mounts at solidsignal by typing the word ronard in the solidsignal search box or buy from ronard.
Here are some places to buy antennas and etc. ,
http://www.solidsignal.com ,
http://www.winegarddirect.com ,
http://www.amazon.com.
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For 1 Tv connected use No splitter. No antenna system amplifier.
For 2 Tv's connected use a simple common 2 way splitter. No antenna system amplifier.
For outdoor coax that is exposed to the weather use the coax that has the compression type coax connectors on the ends of the coax.
Do not use coax that has the Old crimp type coax connectors on the ends of the coax.
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As always , trees and tree leaves do a good job of , multipath/reflecting , absorbing , blocking , OTA=Over The Air , Digital Broadcast Tv stations/channels reception and so do buildings and other obstructions including your own roof and house.
It is best to install The HD7694P antenna at a location that has the least amount to no amount of obstructions of any type or kind in the directions of reception including your own roof and house.
The Tv/s Must Channel Scan for the Digital Broadcast Tv stations/channels , often 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.
Some Digital Tv's will automatic channel scan for cable tv channels.
DO NOT channel scan for cable tv channels.
Go into the Digital Tv Setup Menu and select , 'Air Channels' / 'Antenna Channels'.