Hello I recently purchased a Antennacraft ST2 for use with my GRE PSR-500. I am getting very bad performance around 100 to 165mhz. I have it mounted on a plastic mast on top of my second story so the antenna is about 35' in the air. As it stands now I am getting better reception with the PSR-500's stock rubber ducky than with the scantenna in that frequency range. Do I need to get another antenna to get good reception in Civilian Air? Any recommendations would be appreciated.