Remove the amplifier completely and re-evaluate reception.
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Is there a possibility that the signal boosting device would give me the light, but it is no longer functional?
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Absolutely. The LED simply means it's getting power.
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I'm wondering if I should buy a new device at Radio Shack and try replacing that device to see if it resolves,
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Well, Radio Shack pretty much went out of business last year....
Try it with no amp at all. Your plot indicates that no amp should be needed.