Hello Gerald,
Yes, I saw one of these passive repeaters on Oak Grove Butte - W7O/CN-052 a few years ago. There is a photo here: Oak Grove Butte, OR | October 2016 | pnwsota.org.
Sadly, this summit is one of many that have burned recently in Oregon forest fires. You’ve seen Oak Grove Butte in your sunsets.
Another photo of a passive microwave repeater can be found here: What are they? - #6 by MM0FMF
73, Etienne-K7ATN