A stub (the section in blue) is usually placed near the antenna (orange) to minimize the cable loss. In other words, the parameter d1 is chosen to be the minimum from the set of possible valuse of d1. But sometimes it happens that you have your stub near the transmitter (cyan), that is in your shack.
This is a stub section in such cases. The transmitter is on your left side, and the antenna on your right side. (Actually, it can be reversed, because there is no direction.) As you can see, the end of the stub section is short-circuited, but it can be open if you adjust the length d1 properly.
WARNING: Watch out for the HIGH VOLTAGE!