An upgrade to maximum Digital Tv stations/channels reception at your location is install a Winegard HD7082P antenna Above The Peak Of The Roof in such a manner that the roof and house do not block reception to the south east.
Aim the HD7082P antenna at about 145 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
For 1 Tv connected use No splitter.
For 2 Tv's connected use a simple common 2 way splitter.
For 3 Tv's connected use a simple common 3 way splitter.
For 4 Tv's connected use a simple common 4 way splitter.
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As always , trees and tree leaves , plants and plant leaves , do a good job of , absorbing , multi-path/reflecting , blocking , OTA=Over The Air , Digital Broadcast Tv reception and so do buildings and other obstructions including your own roof and house.
It is best to install the HD7082P 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 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'.
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Digital Tv Tuners can develop - Digital Glitches - that are not cleared out with simple channel scans.
Do a Double Rescan.
http://www.dtv.gov/rescan.html.
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Here ar some places to buy antennas and etc. .
http://www.solidsignal.com.
http://www.amazon.com.
http://www.winegarddirect.com.
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