Looking to replace the long antenna on my new Wrangler, I ordered a 14" billet antenna from AntennaX. Good service and the antenna fit my Jeep using the correct adapter. Looked pretty good.
Yesterday I dropped into my local Harley Davidson dealership and spotted a replacement am/fm antenna for the Harley's. It's 19"s long, quite beefy, flexible and covered in rubber. Bought one, took it home and it was a direct replacement for the AntennaX.
Part Number is Am/Fm Shorty Antenna. 76388-08
There is an identical CB Antenna, so watch what you pick off the display.
And yes, they're pricey...$34 Can.
This is the Harley packaging.
This is a photo comparing the 19" HD antenna and the 14" AntennaX
Part of your problem will be finding the correct antenna adapter for your Jeep and this HD antenna. My adapter was in a selection AntennaX sent with the billet antenna. The adapter has to be a male 5/16" for the Jeep and a male 1/4" for the antenna. Both are coarse threads. I've scoured the internet for a source of the correct adapter.....to no avail. Let us know if you come up with a supply. I have a machinist friend who says he'll make me a few if I need them for friends.
Here's a photo showing the 1/4" adapter sticking out of the Jeep mount.
Here's a photo of the HD antenna installed on my Wrangler.