Found this antenna diagram some time ago. Yes, a Mobile J-Pole Antenna. Going to try a 2m and 70 cm version. Seeing that I every-time lose out on a Diamond N770 Antenna when it is up for sale. Even tried to buy a new one from an amateur dealer but when I wanted to make a EFT payment he did not answer my email. Will not deal with him in future!! If you cannot answer an email then I am not interested in buying anything from you. I could have phoned him but prefer email. After all it is a business transaction!