well for 1/4 wave lengths or lower you will be lower than 9 feet. if they are ride around antenna's the antenna height will be much lower somewhere around 6 to 7 feet because they have coils . if you put up fighting sticks they will be higher a bit because they dont have a coil . try different things and have fun . if ya roofs real long try going 9 feet apart with 2 real long antenna's past 12 feet long . and smack people with a dam 1 pill or 2 pill . lol lol lol lol