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Your plot, as provided, suggests that receiving KSL is somewhere between unlikely, improbably, and impossible. However, there are several checks that need to be made before deciding what your odds truly are.
Did you use the 'accurate method' to pinpoint your rooftop to make your plot?
Can you provide a photo of your existing antenna? What specific direction is it aimed?
Can you provide a photo of what the antenna is looking at when/if aimed directly at the SLC tower location?
During the digital transition, KSL abandoned low-VHF channel 5 (low-VHF isn't particularly friendly to digital broadcasting) in favor of UHF channel 38. One of the favorable attributes of low VHF was its ability to readily bend (diffract) over mountainous terrain while UHF does not and is far more a "line-of-sight" with a much lesser ability to diffract over terrain.
Chances are, your old antenna is a large VHF model that isn't a match for what is now being transmitted from SLC. A photo will clear up that question.
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