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2-3db is a big change in signal Alexis,

what height & coax length are causing the change in signals ?


im leaning towards it been your roof that's effecting the tuning,

tuning 6ft above all that rebar in the roof then raising the antenna up away from it,


i had the same thing happen when tuning 2ft or less from ground then raising the vector up to 12ft & 18ft at my old location.