Metra 40-LX11 Antenna Adapter
2016 Toyota RAV4
Crutchfield Customer Review (What's this?)
Just connect the blue wire even if you don't have a powered antenna. The blue wire is used to power diversity amps in some vehicles, including mine. It made the difference of barely picking up 3 channels to picking up everything and then more.
Pros: Easy to install, plug and play...
Cons: Absolutely nothing