Kinda weak FM no AM?

[EastCarolina]

I had a pioneer AVH 270BT DVD stereo professionally installed in my truck this past weekend. I've noticed my FM Signal isn't as strong and I have virtually no AM signal now. I still get a lot of FM stations just not as many and a couple with static that didn't have static before. No AM to really speak of at all. I'm wondering if maybe they didn't use the European antenna adapter for Chrysler products and just stuck the antenna in there without it? Is that even possible? Or maybe the adapter weakens the signal? Or maybe my antenna had an Amplifier and they didn't hook it up to the harness when they installed the stereo? Or is this just common for aftermarket stereo that the signal isn't as good?

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[Nova5]

antenna adapters are just like speaker adapters to hook to the factory system.. wire with specific ends, no fancy electronics. Nothing that should degrade the signal. Look and see if the antenna adapter fell out of the either the HU's connection or the antenna from the adapters connection. Had it happen when I put it back in one time where the kenwood HU's antenna connection was a wire hanging of the rear with a socket itself, pulled the ant free when when put it in.. oops. no biggie just pull the HU and reconnected it.

 

[Popwarhomie 5,000+ posts]

I had that problem when I installed a DD in my buddies 350z. They have antenna amplifiers you have to splice into. Works great now.