Ive had this 6 inch shaft Nugatron open coil antenna for awhile and dont use it and just had it in my collection of hard ro find items. Ide consider trading this for a sirio 5000 Ive been wanting to try one of these siro antennas on 10 meters for awhile now. Or I would trade for whatever you have that may interest me. These antennas are hard to find thats why Ive held onto it. I know it works because Ive put a stinger (whip) into it and used it.