Yo 357: Looks like a modified Avanti AV-122 PDL-II, that came out in and around 1972 I believe. Or is the antenna called a Golden Nugget in your photos? Hard to tell a lot from your photos.
The white insulator or the other Hubs doesn't look like anything I've seen before on a PLD-II Quad Antenna. They look like that have been modified or replaced as the Hubs were and are the weak link to the PDL-II, Moonraker 4 and 6 beam antennas, and the AV-190 and AV-170 ground plane antennas.
The elements being flattened to be bolted on the replaced Hub look like a home brew job, not a factory issue. This PLD-II antenna can be reassembled, the assembly instructions are on:
http://www.cbtricks.com/ant_manuals/avanti/av122/index.htm
The Avanti Aluminum Hubs were a cast Aluminum material that some times broke during assembly new out of the box. The bolt that tightens the Hub to the mast would crack and break the Aluminum Hub. Avanti when in business would replace them free as they knew the design was terrible. Someone's pipe dream of making cheap parts for cheap for mass production that made the noted antennas become obsolete and scrapped before there time.
New Metal Hubs can be easily machined from billet aluminum at a cost of about 40 to 60 dollars a pair, plus machine set up. The Insulator Hub can be made from Teflon or Dilrin or even Phenolic materials.
The PDL-II Quad Beam Antennas worked pretty good, and would take a fair amount of bad weather.
Jay in the Great Mojave Desert
