At 137kHz I have only dabbled, but I was surprised and delighted at the performance of this little EFP RX antenna. It was mag-mounted on the car yet copied my low uW ERP beacon on the far side of Cambridge at 24km. At this point I stopped!
See https://sites.google.com/view/g3xbm4/home/antennas/137khz-efp-rx-antenna .
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