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Check the listing for details. LibreVNA 6GHz USB Based Vector Network Analyzer VNA + LibreCAL Calibration Kits. Condition: New. Listed at 639.00 USD. LibreVNA 100kHz - 6GHz USB based full 2-port vector network analyzer. LibreVNA (TM) is a USB based full 2-port vector network analyzer designed by Jankae. Many aspects are already comparable to lab-grade VNAs, but this is still a work-in-progress project.