10' of RG-6 will have about 0.5 dB loss. That's not enough to make much if any difference.
The signal from KPIX should be very strong in terms of power level. If you're still having trouble with it after you optimize aiming, you'll need to consider the possibility of multipath. A more directional antenna would be the logical tool in that case. The HD7000R is not extremely directional, but it's certainly more directional than the FV-30.
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