Good Question... Looking at satbeams.com, the footprints of I-11 & SES-6 show a possibility of coverage on C-Band to western US. Your best answer would be from someone on the west coast who could try or has tried to get these. Good Luck!
For San Diego, the 40.5w satellite will be 2.5 degrees above the horizon and 43w is 4.6 degrees. If you have an absolutely clear line of sight to a magnetic compass heading of 87 degrees, you might have a slim chance of receiving 43w at compass reading 85.6 degrees. Highly unlikely to receive 40.5w as there is too much earth noise that close to the horizon.
This web site will be helpful when trying to determine where the satellites at in the sky: http://www.dishpointer.com/
I can pick up almost everything from 40.5w. 40.5 is a great satellite with lots of unencrypted channels. It appears mostly from south America. I just clicked through most of the channels and noticed most of them have lots of beautiful Latin / Brazilian woman. I could not understand what they are saying but they looked good