Many good "reeds" out there that duplicate the eastern cottontail or the Western Jack.
My "Fox" reeds are packaged in the likes of the Knight n Hale, Olt, or Mallardtone calls. Some (like the Knight and Hale) come with extra reeds to go from the low rasp to a high clean notes.
I am sticking with high and clean for the Fox as even a lip squeek can work, that call will greatly increase the range though, specially in the cold air and you may very well see a coyote come in. A lot will be determined by your part of the country.