Metra 40-HD20 Antenna Adapter

Great Value!

Very east product to use. Works perfectly and gives you the easy of not having to replace an expensive wiring harness.

Good product, poor instructions!

This product is of great quality, however, there are no instructions that come with it! Plugging it in is a no brainer. The problem with this is the blue cable that comes out of the adapter, which no one bothers to tell you what is for--not even the own manufacturer's website! After some research, I found out that the blue cable attaches to the "Power Ant", blue cable of the AFTERMARKET head unit. This blue cable provides the signal booster that the antenna needs--as it was built that way by Honda. Without plugging the blue cable you have almost no reception at all, especially from the HD radio stations. I own a 2008 Honda CR-V, so if your car does not have a singal-boostered antenna you may need not install the blue cable, but I'd find out first.