Weaker FM Signal virtually no AM Signal after pioneer install

[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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