Old English Game or the birds from fighting game stock can't be beat for free range where survival is a consideration.
Flighty birds is a good general suggestion but also important is they be medium sized, such as Fayoumis or longtails. Also helpful are birds with long tails instead of short tails as the tail length roughly corresponds to wing area, the more wing area per body weight the better they are able to fly. (not talking about the long tails, more like OEG vs a Rock or Orpington).
I would not suggest bantams for your area, as we have hawks that are murder on any chicks when they are here during the fall and winter. Bantams are too small for a too long time and the hawks can pick them off, the ones around here tend to stop once the chicks reach a certain size.. which is a lot sooner with a standard size breed.
Even so.. if it's for your place, it's too open and backs up to the hills.. even the savviest OEG would regularly get hit hard by the coyotes and bobcats. My dad lives in Loma Linda, his house also backs to the same hills, there have got to be hundreds of coyotes just in that area. A good fence is a must.