Here is a quick check - put the 50 ohm load that you used for calibration and run the same scan as you did for the tri-band antenna. I have had several dual band and tri-band antennas over the years and have generally found the dual band will have acceptable VSWR on both bands, but the tri-bands will generally be ok on 2m/440 and high on 220 or ok on 2m/220 but high on 440. I suspect that for VHF/UHF tri-band antennas to work well on all three bands is not an easy thing to do.
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David S
