The Proxmark RDV4 has loads of antennas available for it but how much extra range does the "long range" high frequency antenna give you ?
You can buy your own antenna here https://lab401.com/collections/rfid-tools/products/proxmark-3-rdv4-long-range-hf-antenna-1
It seems that I managed to achieve the advertised range
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Proxmark RDV4 long range HF antenna testing | NatokHD