This system works well and does what you are asking about very well ....... depends on what you consider expensive.https://convergenthunting.com
As much as I hunt coyotes I wouldn’t consider NOT having at least two of everything I use to hunt predators and ecaller’s are no different. Get the best and have a backup. I use Foxpro’s.
Edited by DStroud (11/08/17 10:19 PM)
"Anyone taking up handloading necessarily plays with unknown factors and takes chances. But so does anyone who drives a car,goes to a cocktail party,eats in a restaurant,or gets married."
Jack O'Connor 1963