okay, i have an even easier one that works well.

Take a 4 inch PVC tube and cut it about 4 feet long. Buy a "U" 4 inch PVC turn. So in a sense you are making a "J". Paint it to match the forest, and hang on a tree. Squirrels have a hard time getting into it as well. they can but not as easy as a ground feeder. You can make this "j" for a few dollars. Then fill it with corn and done. Easy, effective
and cheap.

to hang it, just drill holes on the straight part and use lag bolts. The corn still passed thru but squirrels can get down in there.