Receiver for eletromagnetic radiation between 9KHz to 1000KHz

Hello all



I need to make a simple receiver to measure electromagnetic radiation from light lamps. I need to measure between the frequency range of 9Khz to 1000KHz.
I tried to connect to a spectrum analyzer a simple radio am antenna with a small amplifying circuit, however i detect nothing. I think is because the frequency range is very low.

Can any one give some advice

Thank you