This is a W5GI Mystery Antenna with a 20 Meter Line Isolator. I just purchased this antenna from K4TR Antenna Mfg & Sales. It has not been touched other than to take it out of the box. Before I questioned whether this ant. needed a center support of some kind Joe had it in the mail. At my location with this antenna the center support would have to be in or near my driveway so I decided against it. I will include all paperwork that came with the ant.. The Antenna cost is $89.99 and the Isolator is $22.99. Shipping was $12.35 (min.). Will sell for $115.00, shipped in CONUS. Please email if any questions. firstname.lastname@example.org. You can also see antenna info at K4TR website.