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Yea the FM is not great. Have you replaced any of your lighting with LEDs? They can cause noise that makes the FM a hard time with reception.
The in trunk antennas antennas leave a lot to be desired.
 

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Do you have any aftermarket LEDs on the car? Specifically Angel Eyes or something else that would be on all the time?
 

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After market LEDs can cause serious radio interference but beyond that you need to swap components and see if you can find the culprit.
 

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The way I see it, it could be 1 of 3 things, the DA, the suppression filter or trap filter, I'm assuming the trap filter is for the AM circuit, to keep FM off of it, so may be able to eliminate that one, but not entirely sure?

That link has a diversity antenna for 315MHz. That is not for the radio. That freq is used for garage door and keys.
 
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