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I would opt for the Y10713 High-VHF rather than the CS600. Even if you aimed directly at KRVD on real CH-5 the CS600 lacks the gain needed to overcome the extra noise in the Low-VHF band. The increased gain of the Y10713 would not be overkill given the modest signal levels of CH-8 & 10, particularly with the edge path caused by fairly close terrain.
A single combo antenna may work well, but the flexibility of aiming the two antennas independently may proven helpful.
The CPA-19 is a very good choice.
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