Two quarters works alright as a call, either rubbing the flat sides together or knocking the edge of one against the flat side of the other as you hold it in the web of your hand.Just a tip that works pretty slick on squirrels, download some eastern gray squirrel sounds on your cell phone and use them while you're hunting. A lot of times they will get squirrels to come in and bark and sound off. Also sometimes a good blast on a rabbit distress call will get them sounding off and moving also. You can also get red pine squirrel sounds too. My best spots include water, corn and BIG OLD oak trees. I also sit and scan cut corn fields with my spotting scope and snipe them with my .17 HMR.
Squirrel Calls - Squirrel Hunting Calls App | Decoy Pro