There’s one more wrinkle though… the RDV4 modular system puts the tuning caps on the antenna not the main board… this allows for different performing antennas to be made and easily swapped out, while the rdv2 has it’s tuning caps on the main PCB… so if your rdv2 antenna did have an inductance of 203μH you would still not be able to drop the ProxLF on the rdv2 because the caps on the proxLF antenna itself would change the total capacitance involved and skew the required inductance to match up at 125kHz.