Which dB rating on which report?
A negative dB number just means it is below a critical reference level at 0 dB. Zero dB doesn't mean no signal. Anything stronger than the 0 dB reference level is positive; anything weaker will be negative.
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PS ... get the first 6 ... the "good" ones
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That's all you need for a complete set of the major networks. You're lucky; many others wish their OTA signals were that good.