When you replace the original car radio with an aftermarket car radio then it is possible that the antenna reception is less than with the original car radio. That is why these antenna amplifiers are on the market. This antenna amplifier is easy to connect and improves the antenna reception at least 2 times. In most cases, the antenna reception is even better than you are used to. If you do not have a visible roof antenna, it is certainly advisable to order this part.
For cars with a visible roof antenna, it is usually not necessary. Nevertheless, we at Carpar recommend to order this part. Do not forget to connect the blue wire of this amplifier to 12V.