I have a MXT-550 radio and I am a member of a k9 search and rescue team and we use GMRS radios (yes we have licenses) for training for about 4 hours. I am looking at my best, easiest and cheapest option to use my radio out of my car at a remote base location. I am guessing I need a power source, antenna, and connections for up to 4 hours. Remember we are sometime setting up in very remote locations. I appreciate any input.