Antenna Mounting.. I am afraid of this thing coming OFF my Jeep on the high way. I have the QDC, its bolted to a hitch mount. The mount has an isolator on it to keep it from moving. But the antenna still moves quite a bit. Am I safe? are these 3/8-24 bolts and aluminum mounts going to be enough? Whip length. I have, what I suspect is a 4/160. I have 2' extension and a 6 lobe Cap Hat (For some reason, I only see 4 and 8 lobe cap hats on the website), but no whip. I have an 8' whip to go on, that that will bring me WAY up past 13'. What lengths have you been using?