Find a place to hang a short clothesline at the height of your shortest bug observers.
The line only needs to be about the length of a pillow case.
Then pin a white pillow case to the line.
Bring in a light source. We used a tall lamp with the lampshade removed. We put the light about one foot away from the pillow case. We ran an extension cord to the house to bring power. You could also use a camping lantern.