An upside-down funnel on the pole (into the ground) solves the squirrel feeder issue :)
My favorite in this vein was a metal sleeve on the pole holding the bird feeder that was held up by a weight inside the pole. Squirrel climbs up sleeve, which then falls down due to the squirrel's added weight. Disappointed squirrel deposited back on the ground. It worked until one of the squirrels chewed a hole in the pole and ate through the cord holding the weight. This really happened on a bird feeder belonging to a friend's parents. (Related question: how on earth did the squirrel figure that out?)
Squirrels are smart. :-D
https://www.youtube.com/watch?v=hFZFjoX2cGg
Squirrel maze 2.0
https://www.youtube.com/watch?v=DTvS9lvRxZ8
Oh, and be cautious with those squirrels....
woke: three drones, to stabilize the swinging, and hanging far enough that the noise wouldn't be a bother.
bespoke: a 50' pole interrupted by a 500rpm lawnmower blade at about 15' up, and topped with a bird feeder. The only reason people think squirrel-proof bird feeders are impossible is because they don't want to harm the squirrels. (and, for the record, neither do I)
Outside my office last winter: https://imgur.com/gallery/LTVz9t0