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KWBM 31 carries Fox as a subchannel simulcast of KRBK if rabbitears is right and the tvfool report is wrong when it says MyN
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rabbitears.info is correct. KRBK made a deal with KWBM to provide coverage for the area south of Springfield including Branson and points south towards Harrison since their 5 transmitter DTS system didn't cover much to the south.
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-10 + 16 preamp gain -2 dB preamp NF = +4 NM
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A reminder that antenna gain is the ONLY thing that improves the noise margin. Amplification actually reduces NM by the amount of the amp's noise figure as the amplifier also increases the noise floor by the amount of amplification (plus the NF) resulting in a net decrease of NM. There's a note to this effect in the signal analysis FAQs.
Therefore, the equation should read:
-10 -2 dB preamp NF = -12 NM
Signal power was increased by the amount of amplification as was the noise floor.
