You could just set up a game camera, throw out a 50 pound bag of corn, then go check the pictures.
If there's hogs in the area, it won't take them long to find it.
There's no need to complicate things.
If you really want them to sniff from a long distance... Get this Long Range Attractant. Put it with your corn.
https://texashogbait.com/product/texas-hog-bait-lra/
