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So are you saying that
KOMO Real UHF channel 38
KING Real UHF channel 48
KIRO Real UHF channel 39
KCPQ Real VHF channel 13 and Real UHF channel 22
Were being received and are not being received now , and or , are not being received reliably??
And are other Tv stations channels also missing , and or , not reliable??
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The number 1 cause of - Declining Reception - that gets worse as time goes by is
Water in the connections and water in the coax.
The water corrodes the connectors and connections and gets in to the coax.
When water gets into the coax , the coax is then defective and needs to be replaced.
As a Test of reception , Connect a NEW Continues Length of Coax that has the Compression Type Connectors on the ends of the coax , to the antenna and run the New Continues Length of coax through a open door or window , direct to 1 Tv , no splitters , no ground blocks , no amplifiers , no etc. .
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Remove and Discard All Coax Boots , coax boots , take in and hold water at the connections , holding water at the connections , Is Not Good.
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Aim the C4 antenna at about 190 degree magnetic compass.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointomg/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 scans.
To clear tuner do Double Rescan
http://www.wchstv.com/DoubleReScanAlert.pdf.
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What is reception like now??