Abstract: A radio frequency quad hat system for decreasing transmission power when conducting tests on aircraft when the aircraft is on ground, the aircraft having two wings and two stabilizers, each wing having a leading edge transmitting conformal IFF antenna and each stabilizer having a trailing edge transmitting conformal IFF antenna. The system includes two forward hats, each forward hat corresponding to a leading edge transmitting conformal IFF antenna, the forward hats comprising of frequency selective material and three dipoles; and, two aft hats, each aft hat corresponding to a trailing edge transmitting conformal IFF antenna, the aft hats comprising of frequency selective material and three dipoles, the two forward hats and the aft hats able to transmit and receive communications at a decreased transmission level during testing.

Abstract: The present invention is directed to a radio frequency hat system for decreasing transmission power when conducting tests on the ground, which includes a first hat and a second hat. The first hat corresponds to a lower transmitting conformal IFF antenna, and the second hat corresponds to an upper transmitting conformal IFF antenna. The first hat and the second hat are made from frequency selective material (FSM). The first hat has a first hat dipole, and the second hat has a second hat dipole. The first hat dipole and the second hat dipole are able to transmit and receive communications at a decreased transmission level during testing.