If you are limited to an attic install for what ever reason, the edge path conditions and marginal signal strength reflected in your TVFR argue for using a high gain antenna such as the DB8E. The only way to know if it works is to put an antenna in your attic.
In the Seattle market, KCTS-9 and KSTW-11 would be at risk if you opted not to use a second antenna such as the Y{X}713 types mentioned by timgr. KCPQ-13 simulcasts on real CH-22 from Capitol Hill (the weak signal on real CH-22 at your location is not very promising for an attic mounted antenna though) so a UHF only antenna may be a valid solution if you have no interest in CW and the Seattle based PBS channels. KBTC is an alternate PBS option that might be received with a UHF only antenna.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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