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All joking aside - the shark fin antenna is for internet, cell, satellite radio, and GPS signal capture. Your FM antenna is still mounted around the window frame, or in the back window of a vehicle.I have a Cummins (!) too, but it is a '19. My radio reception doesn't seem very good either. I suspect it is because they went away from a real antenna to the shark fin.
I like the picture of the "Cummings' truck!
If that is where the FM antenna is no wonder the OP is having reception issues. Technically, an FM antenna needs to be around 28" vertical or dipole to work unless you live under the transmitter.Nope. FM antenna is in the shark fin on the passenger side roof of the truck. Satellite radio and gps is in the puck on the driver side of the roof.
Don’t know. All I can say is, my 2017 2500 started life with the old mast antenna, then I swapped in UC5 and retrofitted the FM shark antenna, and I have zero difference in reception between the two, it’s fine. Same with all the other 5th gens I’ve been in, no reception issues.If that is where the FM antenna is no wonder the OP is having reception issues. Technically, an FM antenna needs to be around 28" vertical or dipole to work unless you live under the transmitter.