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Message: <blockquote data-quote="jfmorris" data-source="post: 25590" data-attributes="member: 13408">Actually - that solution won't work as well, as the problem is that there is already an antenna amplifier built into the base of the GM antenna on these trucks, and if it is unpowered, you get barely any signal from the antenna itself, so your dedicated booster would not be getting any signal to boost. Without power to the factory antenna, you probably have less signal available at the dash end of the cable than if you had an old school antenna without such a booster built in.As I researched the issue, some folks who ran into it had tried boosters like that, and they made little difference - due to the fundamental issue of the unpowered built-in antenna amp effectively attenuating/blocking signal from the antenna itself.You really do need to send 12V up that center conductor.This is technically what is needed, but this one is not for automotive use - an RF bias tee:[URL unfurl="true"]https://www.amazon.com/dp/B07Y359TCZ[/URL]Something like that is built into the little cylinder in that Metra 40-EU55 that I linked.  Power can feed to the antenna, but not back into the radio.</blockquote>