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I'm new to OTA tv so forgive my limited understanding of signal strength, but wouldn't putting an attenuator on it then also lower the signal for CHCJ, making it harder to get?
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Your question is very intelligent. I asked the same question when I was learning about overload. It seems counterintuitive to add an amp for more gain, and then insert an attenuator to reduce gain. The short answer is you gain more in increased SNR for the weak signal than you lose in signal strength. To increase your understanding, I can give you the long answer. You have to try something, because the overload is creating spurious signals that damage the weak signal.