I'd start with something like the Cass Creek Preditor model. It's small, digital, inexpensive, and has five sounds. Jackrabbit, Cottentail, Cayote Howl, Pup Yips, and Fawn Distress. I bought mine for around $30.00. I also commendiered the battery powered speakers my son uses with his walkman they have their own amplifier, and really boost the volumne. Cass Creek actually makes an amplified externial speaker for this unit also. Amplification is nice but not neccessary, the unit works well as is. Start out with low volumne, then after a few tries with no response increase the voulmne. The digital calls are real easy, just press the button once and wait for the sequence, it will end after a predetermined time. Then wait for five to eight minutes then press the button again. If no response after 40 to 45 minutes move to another location, usually 1/4 to 1/2 mile away. Then set up and do it all over again. Remember only use the pup and fawn calls when pups and fawns are around in the late spring. My Johnny Stewart is great but expensive, heavy, and very cumbersome.