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How do I know if there is an antenna amplifier wire that needs to be hooked up

You would need to search for information about your specific car from people who would know. In theory, a good car stereo installer would know the answer to this question. I have no idea if the people who installed your stereo are "good" or not. Click here for the FAQ's take on this subject.

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and what does it hook to.. the blue power antenna wire?

If needed, it would connect to either the blue power antenna wire from the tuner extension cable, or if you're not using the tuner extension cable, you could connect it to the amp remote wire.

Earlier you said that the reception changes as you move the empeg up and down. This can mean one of a few things:

- A frayed or intermittent connection on the antenna wire itself, possibly within the connection plug that connects the antenna to the tuner.

- A problem with the wires on the back of the docking sled similar to this problem.

- The need to power an antenna amplifier as discussed above.

- The need for some kind of aftermarket antenna adapter specific to your model of vehicle, such as an adapter for an antenna amplifier, or a diversity antenna adapter.
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Tony Fabris