I've always had good luck with the Slinky. I've used them indoors in both
vertical and horizontal configurations. Looks to me as a helical wire
(slinky) stretched over, lets say 20 ft would have a whole lot more capture
area than a 20 ft wire. I could see where movement from wind could be a
problem outdoors RM~

PS, Walgreen usually has them in their the toy dept..