Disconnect and Remove satellite system passive and active componets such as , multi-switches , multi-plexers , diplexers , combiners , separaters , splitters , amplifiers , power injectors , power supplies and etc. .
Yes the satellite system coaxes and other coaxes that are on or in the house can be used for the antenna system.
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The most Digital Tv stations/channels are the Atlanta area.
Install a Winegard HD7698P antenna aimed at about 356 degree magnetic compass direction.
Here is how aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
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Install a Winegard AP8700 preamp.
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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.
By the HFS splitters at ,
http://www.solidsignal.com , or ,
http://www.hollandelectronics.com.
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Here are some places to buy antennas and etc. .
http://www.solidsignal.com.
http://www.amazon.com.
http://www.winegarddirect.com.
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As always , trees and tree leaves , plants and plant leaves , have a negative effect on broadcast tv reception , multi-path/reflections , absorbing , blocking , broadcast Tv reception , and so do buildings and other obstructions.
The Best Practice is to install the antenna at a location that has the least amount to no amount of obstructions of any type or kind in the direction/s of reception.
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 channels scan for cable tv channels.
DO NOT channel scan for cable tv channels.
Go into the Tv Setup Menu and select 'Air Channels' ~ 'Antenna Channels'.
Scan for channels.