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I wish I had something more positive to inject, but here goes anyway…
I would say that your best chance would be at 2.4 GHz, or maybe 5 GHz, with high-gain directional antennas (probably dishes) on each end. However:
1. 114 miles is a REAL stretch, and I would say possible but not probable. Some hams in Virginia have gone around 70 miles with wireless LAN gear, but see below.
2. The gear you will find is probably wireless LAN stuff. This has a limit of maybe 12-15 miles, not because of radio range, but because you exceed the TCP/IP ACKnowledge window, so the ends just keep telling each other “I didn’t hear you say you got that.” That shoots doing VoIP. There is at least one access point card available where you can change the delay time, but that’s not trivial.
As far as 9 kHz, I don’t know where you will get gear, plus I think you would have a big RF exposure problem in the immediate area. About the lowest frequency in standard use is 60 kHz, which is used by WWVB, the US NIST time station that sets those “atomic” clocks.
13.560 MHz is used for RFID tag interrogation. Unless you have a shipping facility or other user close to your receive site, this could be a possibility with 5 kHz SSB, but I still think you’d need a directional receive antenna (Yagi beam, phased array, etc.).
Finally, you say that this may have to be set up by non-techs. Considering that you are almost trying to squeeze blood from a turnip, you may be asking more than any Part 15 setup could deliver.