http://www.aquamagic.us/generators.htm
Better to chase shadows...
While fog is good, exploiting high humidity is better.
One truly enormous such project could take place in Bisbee, Arizona. This is because it has some 2,200 miles of shafts and tunnels in its mountainous abandoned mines.
The project would begin in the base of the mountain, mining out a giant rock cistern. Large intake vents would face South at the top of the mountain to suck in vast amounts of humid air, that would then be naturally and artificially cooled as it passed through a vertical maze of shafts and tunnels to end up above the cistern as it precipitated out its water. Then very large fans at ground level would push out the now dry, cold air.
It would only operate during the month or so of the Monsoon season, when humid air floods North from Mexico. The rest of the time, solar panels would slowly charge the batteries that would power the fans and artificial refrigeration.
The end result would be a vast amount of acre feet of gray water for desert southern Arizona.