Here is what a N***o owner did.
"I pulled off the outer black cover took out the inside copper spring. From there I diked off the size I needed and trimmed the black cover also. Put it all back together and now I can park in the garage. The antenna is now 2.2 inches long.
I have not found the reception to have changed, but were I live there is not much in the way of radio AM of FM here anyway."
He claims that it works fine.
His antenna did not have the extra wire wrap around the outside. In other words, his antenna has a smooth cover.
Just a thought... the fin base is the Sat radio antenna, the vertical part is for AM/FM.
Or you can get one from here.
www.smallantenna.com
It just screws right on. It has been installed on a N***o as well and works.