Most antler traps I've seen are wire-mesh surrounding a feeding spot, with the intent of the buck getting his antlers entangled in the wire, pulling off the antlers. THAT is a very bad idea, unless you want to see lots of "spike on one side" bucks in the future.
If you want to find lots of sheds, look for (or even create) a low fence bucks must jump over in their travels. The impact with the ground as the buck lands on the other side often causes "ready to drop" antlers to finally fall off. On some TX ranches I've seen antlers piled up on the inside of the hog-proof low fences these ranches install to protect deer feeders from hogs. The fences are only 2 1/2 to 3 feet tall - just enough to keep hogs out but allow deer easy access.