I had one similar to that back in the mid eighties. It was perforated rolled steel, and I pulled it with my motor home as I traveled the country on the racing circuit. I had a Uniden C/Ku receiver and it was everything good about satellite reception that I could have ever wanted.
Darn, I wish I hadn't sold that.
Now, as to your statement that that was sun spots, wrong, that's approaching equinox, and if you really are interested in sun spots, I was reading
this this morning from Huff Post. VERY interesting read, I thought someone would have posted more about it before now.
Photto