My CB hasn't worked in my coach for a long time and after my trip to Florida this past winter, I would like to get it going. I don't know where to start looking. I do get the crackle sound from it but can not hear anyone on it. How can I check 1. the antenna, 2. the cable lead, and 3. the radio itself? In what order is it better to start checking? Thank you. ps. It is a Radio Shack 40 channel model about 10 years old My local truck repair facility has a new Cobra model on clearout for $69.00. Would I just be better off to replace the whole outfit? 98 Beaver Monterey 36 ft.