Don't know much about the 80 Meter radio band, but I did a search on 3.7 MHz and found some weird stuff, among others some acoustical resonance in the atmosphere. So I guess Qiaozhi could elaborate on this one. He didn't explain very well why he chose the 65 kHz frequency for the TOTeM but I suspect this has something to do with it. Again, I've read that 3.7 MHz is too high frequency to penetrate the ground. But just using the passive receiver you might be able to detect surface targets. If you haven't read the info on the AGR Receiver, you should look at it. I think this is the same guy who worked on the Gold Gun.
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