I had good success with my MK VII.
Simple a frame structure about 3' high, 4' long. Sides covered with visqueen and burlap. Holding tank at one end (a small 2gal bucket). Pump in the bucket sends water to top of a frame, drip pipe saturates burlap. A gutter at bottom catches runoff and returns it to the bucket.
Evaps about .5 gallons per hour per side of a-frame, regardless of day, night, overcast, no wind.
I'll see if I can find a photo.
M*A*S*H 4207th: An army of fun.
I don't care what the borg says: feather-wearers will NOT be served in Rosie's Bar.
Yes, I am the arbiter of doing it right or wrong. Guess which one you are!