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Is the antenna a CS2 UHF only antenna or a CS2V UHF/VHF antenna??
For the Testing of reception have only 1 Tv connected.
No splitters , No couplers , No etc. .
Connect a NEW Continues length of coax to the CS2 antenna and run the New Continues length coax through a open door or window , direct to 1 Tv.
Try aiming the CS2 antenna UHF channels 14 thru 51 antenna at about 100 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Use a Real and Actual magnetic compass to aim antenna.
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Digital Broadcast Tv Tuners can develop - Digital Glitches - that are not cleared out with simple channel scan.
To clear tuner do Double Rescan.
http://www.wchstv.com/DoubleReScanAlert.pdf.
The Tv Must Channel Scan for the , ATSC-Digital Broadcast Tv Stations/Channels.
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If trees are close in the directions of reception , reception will not be so good.
If any other obstructions are in the directions of reception , reception will not be so good.
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If , WHTM , REAL VHF high band channel 10 ABC is not received reliably and W07DP-D , REAL VHF high band channel 7 Religion , is not received reliably.
Then install a ,
http://www.antennacraft.net , Y5-7-13 , VHF high band antenna aimed at about , 15 degree magnetic compass direction.
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Connect the CS2 and Y5-7-13 antennas together with a , EU385CF-1s
, UHF antenna , VHF antenna , combiner.
And run the New coax from the combiner direct to 1 Tv.
After installing the 2 antenna set up , Rescan for channels.
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Avoiding obstructions in the directions of reception is Important.
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What is reception like now??