Varmint calling of any kind can be frustrating at times, so I had to change my methods to improve my success and here are some tips that worked for me.
First I had to except the fact that I was not that good at some mouth calls, so I tried an electronic call with real sounds (Not computer generated) and this helped.
First, I went cheep and bought one (I think it was a Johnny Stewart) that used tapes with recorded sounds and the sound quality was poor. Then after having a bobcat jump in the blind with me after the call I decided to go with a wireless remote system, (I also had a friend that had an encounter with a mountain Lion when he sat the call right next to him) to move the call well away from me. (Fox pro) with dual speakers, (One is a metal horn and the other is a speaker). This combination has worked out very well for different calls.
It has 50 calls programed into it for a wide variety of uses. (5 different calls for each species). the big plus with this system is that when calling, the game/varmint is looking for/at the call and doesn't see you. This was a big help for bow hunting because they were focused on the call and didn't notice the movement while drawing the bow.
There are other brands to chose from, but my Fox Pro is over 10 years old and still running great. I talked to Fox Pro about a new remote (Mine is getting worn out) and they said No problem. There customer service Has been very friendly the few times I have talked to them about upgrading some of the calls.
For the really smart Varmints, I hide it in a pile of brush that prevents them from seeing or destroying the call at a good distance away and up wind from me for best results.
Mine looks something like this one except camo.
Amazon.com : FOXPRO Fusion American Made Electronic Predator Call : Sports & Outdoors
www.amazon.com
Long winded, but my experience with calling some game and Varmints.
J E CUSTOM