Studies have shown that dew ponds in Britain gather more water when surrounded by a larger bowl. They capture rain, fog and drizzle. I've never heard of one working in desert conditions.
The Atacama desert has whole plant communities that go on for decades without rain. Dew condenses on needles, stems and branches. Some drips or runs to the ground along trunks and some is absorbed through stomata.
Water has high thermal mass and doesn't make a great condensing surface. Try laying some sheet metal out with a slight slope, so that drips can be caught in a container. Metal cools quickly and will thus allow the process to happen. Measure what you get. If the result looks promising, consider a dew fence. If you get enough to fill a thimble, from a 10 sq ft area, there is hope.
If conditions are right, a dew fence will capture lots of water. If moisture is so low that the dew point isn't reached, you'll get nothing.
A simple indication of likely success would be dew on leaves at dawn. If they are wet, you are reaching the dew point. If they're dry, you are in the wrong place or trying it in the wrong season.
Have I mentioned that when the culvert under my road is in peak flow, it dumps about 53 acre feet of water per day into the valley ?

I've had an unusual interest in watering deserts since I was a kid, but have always lived in moist environments.