Buy a shepherds crook at any home and garden center. They are typically sold wherever hanging plants are sold since their original purpose is to hang pots of flowers and trailing vines. They come with one or two hooks to hang plants from.
Put it in the ground, far enough away from a fence or deck railing or anything else an ingenious squirrel could use as a launching pad to get to the feeder. It's nice to have it within view from a window so you can watch the birds. The narrow metal pole is too skinny for a squirrel to climb up.
Hang a feeder from each hook and fill it with seed. This will be truly squirrel proof and chipmunks won't climb it, either.
Try this if you have a truly bionic and determined squirrel who tries to climb up the pole, or if you have other feeders on wood posts that squirrels can easily climb. Get a plastic garbage sack and use duct tape to tape it around the base of the pole, two or three feet off the ground. Tape it top and bottom so it billows out a little bit. This won't add much to the garden decor, but it absolutely deters squirrels. As long as it's low to the ground, it won't bother the birds.
Buy some fox or coyote urine to rid your property of pesky rodents. Usually sold along with hunting supplies, or in garden stores or online, predator pee will discourage many prey animals to leave your property for safer, less smelly areas. This does not always work if the local rodents are already used to coyote or fox odor, but it is inexpensive and worth a try. Some people swear by used cat litter as a deterrent, which is of course absolutely free if you have a cat, although like the plastic bags, it won't add much to your landscape design. However, finding harmonious ways to coexist with wildlife sometimes requires a little compromise.