The corner reflector is a 75 MHz marker beacon antenna. It is not surprising that you can't get a close call hit. They only transmit about 250 mW and the signal radiates straight up in the air. The wires in the background are a LF NDB antenna. The marker beacon transmits beep tones on 75.0 MHz AM mode. If you post what airport is is near I can tell you what frequency the NDB uses. It will be between 190-530 kHz AM mode and probably only sends a CW ID.