carlw-
I have spent years calling reds & greys with much daytime success, mostly with hand calls. Let me offer a few thoughts: 1st) predators hunt primarily during first hour, last hour, and under the cover of darkness, so those are your best times. During the coldest winter months though, a fox will often hunt during the days peak temps, because critters want to expend the least amount of energy possible to survive, and the cold nights cost them valuable body heat. Also grey fox males & females are denning animals so that puts them underground for much of a day. This trait is why they so quickly share mange. Female reds will den up year round where the male does not. He will climb into a treefall, or brush pile even during the harshest weather, only sharing the den for a few weeks while helping with the pups. 2nd) Reds and greys have different personalities. Reds are very cautious, 95+% of the time using the wind to their advantage, and they favor much lower volumes, and usually food (rabbit, pheasant, lip squeeks, etc.) sounds. Greys like volume and tend not to nearly as wind wise. Grey fox pups distress sounds at a healthy volume will often cause a grey fox to run you over and stick around for a second poke. 3rd) Reds like the open fields and hedge rows, greys favor the woodlots and will scoot up a tree for a better vantage point. Get close to their cover and guard the corners- fox will usually enter a field at a corner. Set up with the wind in your favor and give them the cover of a field corner. Start with low volume red fox sounds, and evolve toward grey fox techniques, because greys will respond to red fox sounds but a red will not come to louder, grey fox sounds. Fox are funny critters, often showing no interest for a call even though they are in sight of very close. Some days they'll ignore you and the next day run you down! Whew! There's a pile of fox info and I hope it helps a little. I hope we hear from a few others here.