Got a friend with a Jack Russel or similar? Give it a day job! A dog will keep the squirrels out.
Funny, one winter in Buffalo ny I bought a wrist rocket sling shot, set up a shooting range in my basement for something to do. Couldn't do anything outside for all the snow. As it happened, many of my neighbors had bird feeders and complained about squirrels each summer…
Well, by May of that spring there wasn’t a squirrel left within 200yds of my house! For the price of a slingshot and a pkg of ball bearings. Several neighbors commented... "Don't know what happened to the squirrels but glad they left".