Minimum mounting height is 1 loop diameter high (about 3 feet or higher) off an earth ground. Place the Alpha Loop higher, so it sees above and past obstacles. The physical environment that surrounds antennas will have an impact on performance.
Consider this when placing an antenna to enhance performance. Do not expect the same performance from an antenna when placed indoors, on a balcony, or near a building as you are experiencing on another antenna that is outside away from obstacles.