Let me see if I can make this question make sense: A buddy and I (he is also a licensed ham nerd too) like to go camping a lot and normally he has his Jeep and HT as well as I. Talking on 2 meters on minimum power and the trips are great. Recently I have been taking an old '63 CJ and we bomb around the National Forest fire trails just in the CJ. Fun as heck but fairly loud and we have to basically yell at each other for a few hours. I have recently considered getting a vehicle intercom system but the ready built systems are expensive and the aviation systems are kind of patchwork. So here is my question: With his HT at 1/2 watt and rubber duck and my HT at 1/2 watt and rubber duck, what is the minimum distance we can talk without overloading the receivers? I figure that both of our radios will be on the door sides so about 5 feet from each other. I know that this is not a typical scenario for ham radio but it does seem like a viable solution. And perhaps, could you run a coax from each one and have it run though some sort of attenuation device? This sounds redneck as heck but again, just looking for a solution to work with the equipment we currently have. I know something like this exists for testing. Thoughts?