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If your head unit signal is bad, please following are some tips to resolve the problems.
Method 1:
You need to push aside the radio antenna fully like this. Use something to make this higher, to make sure the GPS antenna connected tight, and this also can make the radio connected to GND, avoid interface, get a better radio signal.

When you plug in the antenna, if you fell the antenna connection is loose, may cause bad signal.

Method 2: When your car has some noice interference, you can cover the radio antenna by something don’t transfer electicity to avoid this interference.

Cover as long as you can pls, the more you cover, the avoid interference ablity is better.

Because when your car power with unit, the unit shell will be come into being static electricity or interference. This picture to show good cover and connected.

Method 3: This unit radio adaptor which has blue wire,you need connect it to +12V to enhance signal.

Enter into radio,you can choose automatically or hand search station.

When radio presenter show talking,but the background music is very noisy, so you can’t hearing more clear, please turn off ST, because the radio signal source is very week.

The TA, in order to make sure your car driving safety, The RDS station has a traffic information function, if something encountered important transportantion, it will be send this message to you need pay attention to it if you listening radio.

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