I wouldn't worry about putting it at the end of the roof. Give it a try.
Might really kick but. Remember, most mobiles are on the rrear bumper,
same situation as far as the ground goes. My friend here in VEgas had a
screwdriver a high siera on his van and he used it on 160.. It really
worked. We don't know why, but it even out performed the wire I helped
him put up. You just never know.
73s
Butch Bussen
wa0vjr