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Here in the Seattle market, KCPQ has brought their fill-in transmitter online, on real CH-22. The power is lower than the CH-13 transmitter on Gold Mnt. but the CH-22 facility is on Capitol Hill adjacent to KCTS & KSTW so it's easier for you to see it. (Check the 'pending' version of your TVFR.)
I'd suggest you use an Antennas Direct DB4e, an Antennacraft Y5713 and combine the two using an inexpensive UVSJ (UHF/VHF Signal Joiner). That will give you the option of optimizing UHF and VHF aim independently. For sure, you'll get one or both signals from KCPQ.
If the cable is marked 'RG-6' it's the right stuff. If you need to put connectors on one or both ends, you'll want to use connectors designed for both double and quad shielding... unless you know for certain which type cable you have. If the cable already has connectors... no worries.
If you have trees nearby, outdoor mounting will eliminate the attic induced reception impairments, leaving you with just the trees to fight.
FWIW, You've got an excellent TVFR for the Seattle area. I just moved out of Seattle, and had no realistic shot at the signal from Tiger Mnt.
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