You could make a YAGI type of antenna. Set the reflector elements to resonate at the highest plus some end of your frequency, driven element at the center, and the director at the low end of the frequency. I built one like that for my home and it worked pretty well for about 10 days and the a high wind from a Thunder Storm flattened my radio shack and the tower as well. I was working on changing the spacing and tuning to get the best front to back ratio and best receive gain.
You got your elements lengths mixed up. The reflector resonates at the LOWER freq and thus is LONGER while the director resonates at a HIGHER freq. and is shorter. I know you knew that but simply made a typo. I also knew that I just HAD to point it out.