Looking for advice. I like to Jeep in remote areas like Death Valley National Park. I am leaving for Big Ben National Park in a couple of weeks. I know that it is not recommended to off road by yourself but I still want to do it. My question is this; Is there a CB or other type portable radio that would work in the National Parks where I could contact a Park Ranger? This is just in case of emergency, I roll it, have severe mechanical issues, or if I cannot winch myself out.