Pole positions: Base station spotters scrap for prize

16)

This one confused a lot of people, partly because they couldn't tell which thing was pretending to be a radio mast. But the one on the right is a reflective lamp post, while the thing on the left is art, or shopping-mall branding, or something along those lines.

17)

Fencing around the box at the bottom should be a clear indicator of a mast.

18)

This one is also a mast, but quite a small one.

19)

Suspiciously lumpen base with fence - that's a mast.

20)

Symmetrical stench pipes, taking the whiff of the drains above the heads of the pedestrians. Clever, but nothing to do with a cellular network.