In front of my house there are steel pipes sticking out of the ground 7
inches away from the foundation. These are 3/4 - 1 inch thick pipes
that extend up 8 inches to an elbow joint. The elbows connect to a
horizontal top pipe 24 inches long. The top pipe connects the two
vertical pipes to each other. The whole thing forms rectangle that
sticks out of the ground.

There are two of these rectangles in front of the house and another
taller one on the side of the house.

Any idea what these could be?

Thanks,

Russ