I've got the tall Douglas Fir and Western Red Cedar all around also... I can empathize with you. Still, I'd look at the signal report for the conditions at the elevation of your rood peak + 10'. As I look at the path profile of KATU,
http://www.tvfool.com/?option=com_wr...ALLTV%26n%3d11 It looks like you only need a small bit of added height to improve your situation for signals from Portland.
The signals from Salem are blocked by higher terrain. I would expect to need a separate deep fringe antenna dedicated to that market if you are going to have any hope of success in that direction.
Your first TVFR indicates antennas such as the HBU-55, HD7698P or the combination of DB8E + Y10713. But again, it would be helpful to see a TVFR based on added antenna height.