Actually, what look like directional AM arrays Mike refers to are probably the 3 TV (and some FM) towers on Capitol Hill and/or the three tower on top of Queen Anne Hill. I thought the same thing when I first moved here, and learned otherwise during the analog-TV days when I ended up living under the KING-5 tower on the side of the hill, and found my FM and over the air TV reception had a lot of distortion problems.