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That's not a mobile repeater in that pic, its a HAM operating HF. As far as a mobile repeater it really is a waste of time. I have done this already and it was a total disappointment.. Unless your car is at a substantial height advantage you will not have any better coverage then simplex. Again you can and will try to explain or reason away my logic without listening to what I and others have been trying to tell you. I have tried the mobile repeater, the setup was a 50W Motorola SLR 5700 with a 4 cavity BP/BR duplexer connected to a 5.5dB gain antenna on the top of my truck. After testing for about month I realized it had no practical use and only offered slightly more range than simplex, best part I ended up needing a jump after a day at the fair. Mind you this was a $2400 repeater, $800 duplexer with an antenna that was tuned using an Anritsu S331D. I promise I nor anybody on this site will try to steer you wrong, I hold a Commercial, Amateur and GMRS license, own and operate several large repeaters and have all the gear for building, testing and maintaining these kinds of systems.