Looks like a Cellular/GPS combo antenna that you see on most vehicles for things like Ford Pass and Onstar. You should have a normal metal whip for the AM/FM antenna.
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Michael & Angela Foret
North Central Florida
2019 Entegra Vision 31V
I don't have the whip on mines just the same as the OP posted but I do have this same one on my new 2022 ram and it's for everything, my radio, gps, and XM radio.
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2023 Jayco North Point 310RLTS
2022 GMC Denali Ultimate DRW
Retired Army MSG