Inserted between antenna and transmitter, I guess? I see it attenuates from 15w to 1.5w. Does it then attenuate 1.9w to 0.19w? The transmitter offers output adjustment in 1.9 increments. 3.8 becomes 0.38? 5.7, 0.57? & etc? If so, that could be a very helpful circuit to dial in just the right low-power setting needed.