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A while back I bought a MetroVNA and while it worked fine for bench testing filters it was useless for antenna analyzer due to OTA signals overloading the front end.
I believe it lacked RX BPF's. I wonder if the Nanovna would also suffer the same issue with high gain HF antennas.
BTW the SARK is hard to beat as an antenna analyzer. JM3CW
Tim W4YN