What antenna are you using for reception??
Aim a , ANT751 or HBU11 antenna at about 20 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
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As a ->Test<- to prove reception.
Install a New matching transformer (balun) to the antenna.
Connect a New continues length of coax to the matching transformer.
Run the New continues length of coax through a open door or window directly to 1 Tv.
No antenna system amplifiers , No electric/electronic devices , No splitters , No couplers , No coax coupler grounding block , No etc. .
It is the , Antenna , New matching transformer , New coax , Tv.
Scan for , 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.
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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What antenna are you using for reception??
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Do Not use the (SW-29480) antenna.