Lower frequency requires higher heigth... Mike, K5UO On a 40FT tower with a 20ft mast, which antenna would you put on the top of the mast, and which one on the bottom for the following antennas: Cushcraft 40-2CD 2 el 40M beam M-Square 4 element 20M beam Please explain your reasoning for your choice. Thanks John Owens - N7SEJ