| Most newer HUs have a blue wire for a remote turn on for and amp, and a blue wire for the antenna. If you use the amp remote wire for the antenna, the antenna will be up whenever the HU is on. But if you have an antenna remote lead then the antenna should only be up when the radio is on. At least that is how my Alpine and a number of other HUs function.
-Kevin B. 1991 Z32 Turbo Audi S8 Audi A8 Dodge Viper ACR 03 Mustang Cobra
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