I finished my e-caller, and again thanks to shoe and mud for all their info. I did'nt use a thermos though, my e-caller is in it's own fur duffle bag/decoy bag. I don't know if it will work but I think the theory is sound. A fox won't shy away from another fox, nor will a coyote or lynx or wolf. The fox had a bad rub mark on it and now i have a use for it. I'll spray a little fox urine near the caller, prop it up as lifelike as I can and we'll see what happens. I'm hopeing to go out newyears day, when hopefully a lot of others will be sleeping in, or in no mood for loud noise. Any thoughts on this setup? I'd love to hear em.