As a Test , It is best to -->Prove Reception<--.
Connect a Winegard HD7000R All channel antenna to a -->New Coax<-->A Known To Be Good -->New<--Coax.
Connect the known to be good new coax to the matching transformer(balun) at the antenna and run the Known to be good New coax through a open door or window and connect the known to be good New Coax direct to 1 Known to be Good Tv.
No grounding couplers , No couplers , No splitters , No electric or electronic devices , No passive devices , No nothing and No etc. .
Zip , Zero , Zilch.
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It is the HD7000R All channel antenna the matching transformer the coax the Tv , and that is it.
Install the HD7000R antenna Above The Roof in such a manner that reception is not blocked by the roof and house in the directions of , east , east north , south east , south west , west north.
Aim the HD7000R All channel antenna at about 90 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
A Winegard DS3000 , J pole type antenna mount will work Ok for a antenna mount.
Here are some places to buy antennas and etc. .
http://www.solidsignal.com.
http://www.amazon.con.
http://www.winegarddirect.com.
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As always , trees and tree leaves , plants and plant leaves , interrupt and degrade Tv reception by , absorbing , multi-path/reflecting , blocking , Digital Broadcast Tv reception and so do buildings and other obstructions including your own roof and house.
It is best to install the HD7000R All channel 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 Must Channel Scan for the , OTA=Over The Air , 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 Tv Setup Menu and select , 'Air Channels' ~ 'Antenna Channels'.