Affiliate Marketing Secrets

I have an indoor antenna that sits on top of our television. The other day, I had it scan for channels (because I heard about a newer channel in our area, so I wanted to make sure the antenna / guide were up-to-date).
When it was done searching, one of the channels it found was 6-1 KOIN HD, which is the CBS affiliate for Portland, Oregon, but I live over 215 miles away in southeastern Washington state! How is it getting the signal? There are no translators for that station anywhere around, and there isn’t a need for one, because my area has its own CBS, NBC, etc. affiliates.

I am moving to Portland in January 2012 but I am going to visit this coming week to check out how I like it. I would love any info any one has about Portland: work, where to live, where to find places to live, bookshops, farmers markets, parks, transportation, neighborhoods, downtown, places to hangout, best kept local secrets, best places to eat, etc. Anything you can tell me will be helpful. I have done some research in books, but I am looking for something beyond the tourist guides. I want to experience the local culture.
I am going to be attending PSU in a graduate book publishing program in the winter semester.