UPDATE:My homemade bird feeder has won! The squirrels have chewed right through the top of dad's feeder. I had to enlarge the feeders on mine, but eventually mine emerged victorious.
These are the two "squirrel-proof" bird feeders. One comercial, the other homemade.
In this corner, the comercial feeder!
In this corner, the homemade feeder!
We just put them up, but I will let you know who wins The Battle of the Bird Feeders!