I’m on a local ham radio mailing list. (Though I’m actually not sure how this came to be.)
So a few neat links. The first is a yagi for 160 meters. Antenna size is inversely proportional to frequency, and 160 meters is the lowest ham radio frequency out there. The notion of a 160 meter yagi is almost obscene. You can just barely make out that there are two people working in the antenna.
There are also photos as a neat site called Artificial Owl of the former Russian Woodpecker, a Cold War-era “over-the-horizon radar” meant at detecting incoming missiles. It’s rumored to have transmitted as much as 10 million Watts (ERP), spewing interference all over the HF/shortwave bands the world over.