We use Cobra Micro-talk two-way radios with the push-to-talk headsets. Don't get the voice-activated headsets - the wind causes all kinds of trouble with those. We have as many as 5 guys on a set-up at times out here - and you don't want all 5 of guys sitting close enough to cause ol' wiley to be suspicious. There is no security compromise using these devices - I put each hunter where I want him and we all know which zone to cover. The only time we didn't use them last season it cost us, big time. There 5 of us covering two ravines that opened into a huge coulee. I set the foxpro about 80 yards out in front of me - breeze was < 5 mph in our face and we had heard some howling from the coulee about 30 minutes prior to our setup, so we KNEW there were coyotes to be had. Anyway, I setup in the middle ravine with two other shooters to my left; another shooter covered the ravine to our right and the last shooter covered our six. The shooter on my right, in the next ravine, watched FIVE coyotes paying very close attention to my howler. Then he watched four of them come on the dead run straight toward the foxpro after I opened up the busted bunny blues . . . From my position I could see only one coyote, while the two shooters to my left saw four of them trotting in a straight line directly toward the foxpro. The foxpro was muted when I got the lead (and only coyote, as far as I could see) in my sights. I dropped the hammer at about 100 yards and the lead coyote dropped like a sack of potatoes. Then all hell broke loose - the two shooters on my left opened up as well as the shooter on my right. It sounded like WWIII out there, and I'm NOT kidding. If we had been using our two-way radios I would have been made aware of the number of coyotes coming to the call and that, in turn, would have given me opportunity to allow the lead coyote to come a little closer and I would have also been able to coordinate a lot better use of our bullets!
Go get some reliable two-way radios and push-to-talk headsets and use them every time - you won't regret it.
Good luck & God speed!
~Scott