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The power antenna lead is not just for a motorized telescoping antenna. All of the BRZ/FR-S/86 models (with the stubby antenna on the roof), as well as other Subarus and Toyotas with foil antennas on the rear glass, have an antenna booster amplifier. You must supply +12V power to that, or you'll have poor reception.
I don't know about Toyotas, but the Subaru ones start getting wiggy if the supply drops any below 12V (i.e., 11V won't suffice).
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