I agree, the HD7000R is not enough antenna to ensure reliable reception of the KCWX real CH-5 signal. The Winegard YA6260 paired with the AP3700 is a better choice.
I would like to offer that there is a way to combine the antennas into a single down-lead. The attached diagrams show how to connect a Low-VHF and CH-7 to 69 antenna into a common down-lead.
The two diagrams are different so that this arrangement can be built using a HLSJ that does pass UHF... or with one that does not. Diagram "Low VHF combining into H-VHF and UHF with broadband H-VHF port HLSJ.pdf" is for use with UHF passing HLSJs. Diagram "Low VHF combining into H-VHF and UHF.pdf" is for use with HLSJs that attenuate UHF signals.
This HLSJ is spec'd to pass up to VHF CH-13, implying that it may not pass UHF:
http://www.solidsignal.com/pview.asp...-%28ZHLSJ-1%29
Here's an example of a UVSJ:
http://www.solidsignal.com/pview.asp...nna-%28UVSJ%29