Mount Sylvania is a suburban drive-up site in Lake Oswego with nearly panoramic views of the West Hills, Portland, and points eastward.  Directional antennas up though microwave bands do well at this site.  Despite its dense residential neighborhood setting the RX noise levels observed were low.  A weather station and several vertical antennas are on the summit, but I did not observe these to create any tx/rx issues on any bands I tried.