The Y10-7-13 is a perfect antenna for your situation.
If in your shoes, I would also replace the 8700 pre-amp with a
dual input RCA unit. This amp will alllow you to join the 2 antennas most efficiently. It will also help address possible interference concerns with FM 96.3 from Big Mountain. You also have a channel 10 closeby that may cause problems with the less tolerant 8700 preamp.