While I have never had bantams, I have tried numerous other theories in predator protection. Truthfully, nothing is fool proof. I had white chickens - yeah, huge predator bait, but now I am not so sure if it was the demeanor or the color.
Currently I have darker colored flock except for a new OEG, I think, faster than lightening, and actually survived for a week on her own, before I got her captured again.
Many people do not think so, but a mature rooster will really help me for lowering daytime predation, but again, it depends on the rooster. Some are MUCH better than others. You need one that is the first to see you, when you approach the set up, and one that can get between you and the hens. So you want one that is aware, but not human aggressive. A tricky combination.
I think owls, hawks, and coyotes are my biggest daytime predators. We have cattle, and when the yearlings are in the same pasture as the chickens, I almost never have day time predation, I think the coyotes don't like the yearling cattle.
The best solution is a very good fence. But I swear coons can find ANY weakness.
I keep a flock and have lost a lot of birds, and added a lot of birds. As my granddaughter says, "Well this is the circle of life... and now we can get new chicks." A bit heartless to some, but doable to us.
Mrs K