The antenna starts at the point that the center conductor is no longer surrounded by any sort of shielding. It's not really clear to me where that is, in the picture you posted, but I would guess it to be at the 1.15" mark.
The antenna starts at the point that the center conductor is no longer surrounded by any sort of shielding. It's not really clear to me where that is, in the picture you posted, but I would guess it to be at the 1.15" mark.