Where on the west coast? What frequency range, antenna type, size are you trying to measure? You can always check with a nearby university or goto ww.rfcafe.com select vendors and then antennas. Then call the antenna vendors to see which ones perform outside work.
Check out:
Center for Research and Services
College of Engineering and Computer Science
California State University, Northridge
18111 Nordhoff St., M/C 8295
Northridge, CA 91330-8295 USA
Phone: 818-677-2146
Fax: 818-677-5982
http//maxwell.ecs.csun.edu (note: I got a sever time out when I tried to go to this page)