And let's measure 455 kHz IFT frequency response....

We can see "shape" of response, but the issue is amplitude value. If I found just inductor can provide 40dB gain, I will get Nobel prize (or Edison medal?) As you see, the shape is correct, and it seems it has a resonant frequency of 439 kHz but its absolute value of amplitude is not reliable at all. This is not connection issue but may be impedance mismatch or,,,, transmission evaluation is made just by voltage, and multiplied voltage by IFT may producing miracle 40 dB.