You're right to be somewhat concerned about the
HD-7698's directionality, but its high gain isn't really needed here as long as the antenna is to be installed above the roof (as indicated by the 25-foot height in the report). I'd recommend pointing an
HD-7696P at about 34 degrees (true azimuth) to split the difference between KCPQ Fox 13.1, your strongest station, and the group of stations at 52-56 degrees true. The antenna would then be pointed almost directly at your MyNet, ABC, NBC, PBS (9.1) and CW affiliates, plus CBS affiliate KIRO's main transmitter on channel 39.
KIRO's nearby channel 34 signal is a translator, and its channel 39 signal should be strong enough that you can ignore this off-direction signal. The PBS and CW affiliates on VHF channels 9 and 11 are a bit too weak for any UHF-only antenna to work reliably at that distance.
Try the antenna by itself, but be aware that with two TVs and those signal strengths, an antenna pre-amplifier might be necessary for dropout-free reception across all channels, regardless of antenna choice. Adding a pre-amp later is a brief, straightforward task. A Winegard HDP-269 would provide plenty of gain to do the job well should that become necessary.