This tower is located at 1399 Hollenbeck Ave. in Sunnyvale, near Challenger School and Nimitz Elementary School. It adds more capacity to an existing tower to add antennas for Clearwire to those already present for AT&T.
Sunnyvale Planning Commission meeting minutes, where the project was approved:
http://www.sunnyvale.ca.gov/Portals/0/Sunnyvale/bc_minutes/2010/pc-2009-0679-m.pdf
This decision was appealed, and here are the minutes from the Sunnyvale Planning Commission hearing, detailing neighborhood opposition to the project:
http://www.sunnyvale.ca.gov/Portals/0/Sunnyvale/NonCouncilReports/pc/2010/pc-2009-0679.pdf
Also note in the Project Design section that "staff has been concerned that the current monopine was not constructed as originally designed."