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With one end open you will get perfect reflection altered only by the cable loss round trip, so S11=twice the cable loss. That is as long as you can assume the open and is not acting like an antenna, that should be a good assumption into the low GHz for SMA cables.
cant measure s21 because its only a one port measurment if one end is open. S11 should do the job, another way is to compare a short to a matched load.
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