I've done reasonably well with a wounded-rabbit call. And, yeah, coyotes do have a serious set of ears: I happened to be calling at a site where I could see a pretty good distance. I called fairly loudly; two coyotes immediately started running toward me from well over a half-mile away.
I've used the Burnham Brothers wounded rabbit casette tape to good effect. I often just set the "baby boom-box" on the hood of my truck. I grant I'm not hunting well-educated coyotes, though. I've called back-country coyotes up in mid-afternoon and had them run around the truck and bark. I guess it's, "Where's my rabbit? You SOB, you promised me a rabbit!" Can't shoot; laughing too hard.
, Art