It's a Mosley A-511 their 11 meter beam. You solder the center pin to the hot side of the driven element which is insulated from the boon and solder the shield to the other side which is grounded to the boom. This antenna was built special for me on a 3 inch boom and all the large elements like on their big HF antennas. You can rest assured that it works very well. There will be a drip loop going up and both sides will be taped with a layer of black tape a layer of waterproof tape and another layer of black tape. This will be overkill this time lol.