Pioneer Square (AKA Pioneer Courthouse Square) is a large brick flatspace in downtown PDX, between SW 5th, 6th, Morrison, and Yamhill. Recently, a PioneerSquareAccessPoint was built, unwiring the entire square. There's a Starbucks on the northwest corner, a hang-out of many unemployed PersonalTelco members. Here's a view from the southwest corner:
http://www.pioneersquare.citysearch.com/71.jpg
The antenna for the AccessPoint is located on the 8th floor of the building visible directly across the street from the square, in that image.
KGW has a webcam [http://www.kgw.com/livecams/kgwskycams_pioneer_square.html available] on the opposite corner of the above image.