So the "antenna" is a wire between a signal generator and the input of the opamp?There is no information on the signal. It is a plain 1kHz signal that is being captured. EMF. I will probably be using an RC Low pass filter of 0.5-1Hz to make it a smooth line on its average.
Connecting a 14" piece of wire to the input of a high-input impedance amplifier is only going to pick up electrical noise and a bunch of 50/60 Hz powerline stuff. What is the application? What do you expect to see if you filter the powerline and its harmonics?