If you are highly skilled at building radio equipment then I would sugget that you build a sensitive reciever for the frequency bands that you are interested in, I would think the signal should be shielded and sent to a high-impedance amplifier, similar to the way the ion detector handled the signal. When you have the amplified signal, then you can add any stages you want to demodulate it or process the signal in other ways. It might be good to make provisions that will allow to adjust the bandwidth of the signall recieved as well as the frequency. I really don't have a clue for what kind of signal processing would be interesting to try.
I still think it would be good to attach an oscilloscope to the reciever so see the full spectrum of what you are picking up. If you have access to a small battery powered scope, then it would be good to connect it into the amplifier output and see what changes when you move the reciever to different locations.
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