Kenny, these guys are right. Forget about what prey critters that you do or don't have naturally resident in your area. The emotion, agony and pitifulness of the sound is what brings them in.
I call most of my Reds with open reed mouth calls but FoxPro has some good sounds for them for sure. Bird distress is always magical on Red Fox. Lucky Bird is a good one. I have Johnny Stewart's "Squealing Bird" on both my Scorpion and my FX5 and killed at least one double on Reds last winter using that sound.
Stay out of the thick cover when hunting Reds (for Grays that is great, but not Reds.) Reds play the wind more than a Gray, and you want to be able to see them downwind. Give em more room to respond than a Gray as well(call larger areas), not such tight areas.
Good luck