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31.5ft is too long for the vector imho, somewhere between 29.5 and 30.5ft depending on radial angle and height above ground is about right,


the avanti uses a thicker radiator with only 3 radials so it needs to be shorter than the 4 radial vector for the same electrical length,


when both are tuned for best signal the longer vector 4000 outperforms the stock length avanti.