drees said:The base doesn't come off. It contains electronics for the antenna and a GPS/satellite patch antenna. You can only unscrew the antenna sticking up, and the shark fin should be large enough to fit over the whole assembly.
I did this mod on my Prius and can say that FM/AM reception suffered considerably. Only did it because I lost the antenna in a car wash.
I damaged the base of the antenna on my LEAF (don't ask) and opted to replace the entire assembly which requires dropping the headliner.
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