Thanks guys!
Rabbit, attached is my FM fool report.
I knew they were from Idalia repeaters, just meant the channels were Denver channels. My county is the only county in eastern CO that turned their repeaters off in 2007.
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I forgot about the terrain model/map... In 2012 I was definately in a more solid band of the Idalia transmitter.. I wonder if they lowered the power or something. I theorized tree growth as well... but just found it too coincidental that I also progressively lost Kansas channels.
Whats a way to test a cable to know its "proven" as mentioned by JoeAZ? Test resistance?
Other than that... sounds like I just need to give up on the Idalia/Denver channels.
Thanks!