Check the MFJ website: http://www.mfjenterprises.com They have 2 or 3 telescoping antennas. The only one that is duo band is the 2 meter quarter wave which will work on 440. The 3 eights wave and half wave models are strictly for 2 meters. These telescoping antennas all have BNC connectors. I have never seen one with an SMA. As has been said, however, don't walk about, especially indoors, with these antennas extended. It's like holding the handle of your cane near your nose with the rest of it pointed at the ceiling! It gives a whole new meaning to the term "upward mobility!" Mike Duke, K5XU American Council of Blind Radio Amateurs