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I have a metal roof also, I was having 4 to 5 SWR on mine too and couldn't get it down. I was even scared to try and key up to check it, it was so bad. I put a ground on it with a muffler clamp on the  lower section of pole with a battery cable over to a ground rod in the ground about 4 feet. My SWR came down to 1.3/1 with nothing else done. oh yea I have a Imax 2000 antenna